A091669 - OEIS

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A091669 as a simple table

n	a(n)
1	1
2	1
3	2
4	7
5	42
6	434
7	7812
8	248031
9	14055090
10	1436430198
11	267176016828
12	91151551074486
13	57425477176926180
14	67196011936600334340
15	146782968474309770332296
16	601204690999713530559792879

[1,1,2,7,42,434,7812,248031,14055090,1436430198, 267176016828,91151551074486,57425477176926180, 67196011936600334340,146782968474309770332296, 601204690999713530559792879]