Dado que no he conseguido encontrar uno hecho en Internet, publico este que acabo de hacer por si a alguien más le sirve.
<?php
/* Rafael Vargas <http://rafavargas.com> */
$mapa = array (
'01' => array('09','20','26','31','48'),
'02' => array('03','13','16','18','23','30','46'),
'03' => array('02','30','46'),
'04' => array('18','30'),
'05' => array('10','28','37','40','45','47'),
'06' => array('10','13','14','21','41','45'),
'07' => array(),
'08' => array('17','25','43'),
'09' => array('01','26','34','39','40','42','47','48'),
'10' => array('05','06','13','14','37','45'),
'11' => array('21','29','41'),
'12' => array('43','44','46'),
'13' => array('45','16','02','23','14','06','10'),
'14' => array('06','13','23','18','29','41'),
'15' => array('27','36'),
'16' => array('19','44','46','02','13','45','28'),
'17' => array('08','25'),
'18' => array('23','02','30','04','29','14'),
'19' => array('42','50','44','16','45','28','40'),
'20' => array('31','01','48'),
'21' => array('06','41','11'),
'22' => array('25','50','31'),
'23' => array('13','02','18','14'),
'24' => array('33','39','34','47','49','32','27'),
'25' => array('17','08','43','50','22'),
'26' => array('01','31','50','42','09'),
'27' => array('33','24','32','36','15'),
'28' => array('40','19','16','45','05'),
'29' => array('14','18','11','41'),
'30' => array('02','03','04','18'),
'31' => array('20','22','50','26','01'),
'32' => array('27','24','49','36'),
'33' => array('39','24','27'),
'34' => array('39','05','47','24'),
'35' => array(),
'36' => array('15','27','32'),
'37' => array('49','47','05','10'),
'38' => array(),
'39' => array('48','09','34','24','33'),
'40' => array('47','09','42','19','28','05'),
'41' => array('06','14','29','11','21'),
'42' => array('26','50','19','40','09'),
'43' => array('25','08','12','44','50'),
'44' => array('50','43','12','46','16','19'),
'45' => array('28','16','13','10'),
'46' => array('44','12','03','02','16'),
'47' => array('34','09','40','05','37','49','24'),
'48' => array('20','01','09','39'),
'49' => array('24','47','37','32'),
'50' => array('31','22','25','43','44','19','42'),
'51' => array(),
'52' => array()
);
?>
