A190657 - OEIS

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A190657 as a simple table

n	a(n)
1	1
2	1
3	3
4	10
5	42
6	244
7	2031
8	22714
9	342292
10	6943430
11	188479666
12	6843502049
13	331910774405
14	21483424837024
15	1854744805774187
16	213498320443922663
17	32758157589935274374

[1,1,3,10,42,244,2031,22714,342292,6943430, 188479666,6843502049,331910774405,21483424837024, 1854744805774187,213498320443922663, 32758157589935274374]