A053040 - OEIS

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A053040 as a simple table

n	a(n)
1	1
2	2
3	4
4	12
5	137
6	102521
7	5067156572650
8	507566352736797478112105408650
9	545815719374972260690482400458116738905180797374198467059067284838

[1,2,4,12,137,102521,5067156572650, 507566352736797478112105408650, 54581571937497226069048240045811673890518079737419\ 8467059067284838]