A007836 - OEIS

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A007836 as a simple table

n	a(n)
0	1
1	1
2	1
3	5
4	23
5	151
6	1141
7	10205
8	103823
9	1190191
10	15151981
11	212222405
12	3242472023
13	53670028231
14	956685677221
15	18271360434605
16	372221031054623
17	8056751598834271
18	184647141575344861
19	4466900836910758805

[1,1,1,5,23,151,1141,10205,103823,1190191, 15151981,212222405,3242472023,53670028231, 956685677221,18271360434605,372221031054623, 8056751598834271,184647141575344861, 4466900836910758805]