A162161 - OEIS

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A162161 as a simple table

n	a(n)
0	1
1	1
2	3
3	13
4	73
5	561
6	5251
7	57583
8	739089
9	10794241
10	176570371
11	3209512791
12	64116701353
13	1396247370961
14	32941566738627
15	836962322583871
16	22785381648804001
17	661810614930630273
18	20428823103775758595

[1,1,3,13,73,561,5251,57583,739089,10794241, 176570371,3209512791,64116701353,1396247370961, 32941566738627,836962322583871,22785381648804001, 661810614930630273,20428823103775758595]