www.mikescher.com/www/statics/euler/Euler_Problem-015.php

<?php

return 
[
	'number'      => 15,
	'date'        => '2014-09-11',
	'title'       => 'Lattice paths',
	'abbreviated' => false,
	'steps'       => 61202,
	'time'        => 47,
	'width'       => 78,
	'height'      => 27,
	'value'       => 137846528820,
];