A155229 - OEIS

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A155229 as a simple table

n	a(n)
3	1
4	4
5	10
6	19
7	54
8	346
9	1831
10	9221
11	66079
12	717157
13	8272905
14	104484553
15	1712695513
16	36940968544
17	931841300560
18	27497789520438
19	1009266090959240
20	46345568210962143

[1,4,10,19,54,346,1831,9221,66079,717157,8272905, 104484553,1712695513,36940968544,931841300560, 27497789520438,1009266090959240,46345568210962143]