A125786 - OEIS

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A125786 as a simple table

n	a(n)
0	1
1	7
2	39
3	216
4	1274
5	8200
6	58017
7	451283
8	3847960
9	35818351
10	362337006
11	3965467281
12	46749441514
13	591291743032
14	7993582141984
15	115104783083605
16	1759853074058289
17	28485332959460764
18	486811835886953020

[1,7,39,216,1274,8200,58017,451283,3847960, 35818351,362337006,3965467281,46749441514, 591291743032,7993582141984,115104783083605, 1759853074058289,28485332959460764, 486811835886953020]