A159925 - OEIS

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A159925 as a simple table

n	a(n)
1	1
2	3
3	12
4	61
5	370
6	2606
7	20925
8	188772
9	1890773
10	20822481
11	250082522
12	3253176309
13	45567394330
14	683783923476
15	10944068960451
16	186098265906832
17	3350501663825617
18	63671208559149815
19	1273621946395366224

[1,3,12,61,370,2606,20925,188772,1890773,20822481, 250082522,3253176309,45567394330,683783923476, 10944068960451,186098265906832,3350501663825617, 63671208559149815,1273621946395366224]