| EXAMPLE
|
1, 1, 1, 1, 1, 1, ...
1, 4, 15, 56, 209, 780, ...
1, 15, 192, 2415, 30305, 380160, ...
1, 56, 2415, 100352, 4140081, 170537640, ...
1, 209, 30305, 4140081, 557568000, 74795194705, ...
1, 780, 380160, 170537640, 74795194705, 32565539635200, ...
|