A136732 - OEIS

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A136732 as a simple table

n	a(n)
0	1
1	3
2	9
3	43
4	324
5	3510
6	50528
7	913377
8	19918602
9	509040779
10	14918466255
11	493115508126
12	18143982947900
13	735340631600946
14	32542320101428755
15	1561227609244084205
16	80700623119099359600
17	4470904603875492038790

[1,3,9,43,324,3510,50528,913377,19918602, 509040779,14918466255,493115508126,18143982947900, 735340631600946,32542320101428755, 1561227609244084205,80700623119099359600, 4470904603875492038790]