A064845 - OEIS

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A064845 as a simple table

n	a(n)
1	1
2	1
3	2
4	5
5	31
6	1231
7	1917121
8	4667676800641
9	27640053867460068128570881
10	969475805641849161579046591814284573846079748476161

[1,1,2,5,31,1231,1917121,4667676800641, 27640053867460068128570881, 96947580564184916157904659181428457384607974847616\ 1]