A197564 - OEIS

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A197564 as a simple table

n	a(n)
1	1
2	3
3	4
4	18
5	51
6	266
7	1518
8	11396
9	111218
10	1345019
11	21178437
12	420441727
13	10691248879
14	346431341394
15	14306876354446
16	754052504644414

[1,3,4,18,51,266,1518,11396,111218,1345019, 21178437,420441727,10691248879,346431341394, 14306876354446,754052504644414]