A317794 - OEIS

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A317794 as a simple table

n	a(n)
0	1
1	1
2	2
3	8
4	180
5	612032
6	200253854316544
7	263735716028826427534807159537664
8	5609038300883759793482640992086670066760184863720423808367168537493504

[1,1,2,8,180,612032,200253854316544, 263735716028826427534807159537664, 56090383008837597934826409920866700667601848637204\ 23808367168537493504]