A002665 - OEIS

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A002665 as a simple table

n	a(n)
0	0
1	1
2	1
3	2
4	5
5	34
6	985
7	1151138
8	1116929202845
9	1480063770341062927127746
10	1846425204836010506550936273411258268076151412465

[0,1,1,2,5,34,985,1151138,1116929202845, 1480063770341062927127746, 1846425204836010506550936273411258268076151412465]