A002825 - OEIS

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A002825 as a simple table

n	a(n)
1	1
2	2
3	9
4	40
5	355
6	11490
7	7758205
8	549758283980
9	10626621620680257450759
10	1701411834605079120446041612344662275078
11	79607061350691085453966118726400345961810854094316840855510985234351715774913

[1,2,9,40,355,11490,7758205,549758283980, 10626621620680257450759, 1701411834605079120446041612344662275078, 79607061350691085453966118726400345961810854094316\ 840855510985234351715774913]