A177559 - OEIS

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A177559 as a simple table

n	a(n)
1	1
2	6
3	90
4	2448
5	105218
6	6572088
7	562874958
8	63344668632
9	9067009872984
10	1608913338743280
11	346665863545391736
12	89160540714537206616
13	26982910637581823115028
14	9492077262717161359915632

[1,6,90,2448,105218,6572088,562874958,63344668632, 9067009872984,1608913338743280,346665863545391736, 89160540714537206616,26982910637581823115028, 9492077262717161359915632]