A001699 - OEIS

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A001699 as a simple table

n	a(n)
0	1
1	1
2	3
3	21
4	651
5	457653
6	210065930571
7	44127887745696109598901
8	1947270476915296449559659317606103024276803403
9	3791862310265926082868235028027893277370233150300118107846437701158064808916492244872560821

[1,1,3,21,651,457653,210065930571, 44127887745696109598901, 1947270476915296449559659317606103024276803403, 37918623102659260828682350280278932773702331503001\ 18107846437701158064808916492244872560821]