A320987 - OEIS

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A320987 as a simple table

n	a(n)
0	0
1	1
2	5
3	26
4	655
5	81901
6	255941280
7	99977062581901
8	122042312722047375081905
9	58194309578918159047081570466564535026
10	33873546390630164560327289199086683235486077084641297863363155

[0,1,5,26,655,81901,255941280,99977062581901, 122042312722047375081905, 58194309578918159047081570466564535026, 33873546390630164560327289199086683235486077084641\ 297863363155]