A139086 - OEIS

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A139086 as a simple table

n	a(n)
1	1
2	1
3	4
4	30
5	316
6	4116
7	62296
8	1058418
9	19764860
10	400070484
11	8693577528
12	201394483524
13	4947738765928
14	128383644586440
15	3507060528884560
16	100587324451979478
17	3022202483800235964
18	94935204982349494092

[1,1,4,30,316,4116,62296,1058418,19764860, 400070484,8693577528,201394483524,4947738765928, 128383644586440,3507060528884560, 100587324451979478,3022202483800235964, 94935204982349494092]