A111977 - OEIS

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A111977 as a simple table

n	a(n)
0	1
1	2
2	4
3	13
4	57
5	369
6	3681
7	59073
8	1579393
9	72188673
10	5749089793
11	809616264193
12	204018868459521
13	92907742733348865
14	77097057406948106241
15	117413997231333438701569
16	330195264668839727287861249

[1,2,4,13,57,369,3681,59073,1579393,72188673, 5749089793,809616264193,204018868459521, 92907742733348865,77097057406948106241, 117413997231333438701569, 330195264668839727287861249]