A011835 - OEIS

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A011835 as a simple table

n	a(n)
1	1
2	2
3	7
4	43
5	471
6	9705
7	398663
8	34221167
9	6366566540
10	2641102182925
11	2498210880028303
12	5484438524509076715
13	28346990140510757039949
14	349039307360779249087131805
15	10340590252034005587340296182702

[1,2,7,43,471,9705,398663,34221167,6366566540, 2641102182925,2498210880028303, 5484438524509076715,28346990140510757039949, 349039307360779249087131805, 10340590252034005587340296182702]