A124347 - OEIS

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A124347 as a simple table

n	a(n)
1	1
2	2
3	9
4	52
5	425
6	4266
7	52507
8	754944
9	12499209
10	233296030
11	4852006181
12	111149993736
13	2781312439633
14	75460291482772
15	2206445155886805
16	69163853027437216
17	2313709581153992033
18	82271226298253976054

[1,2,9,52,425,4266,52507,754944,12499209, 233296030,4852006181,111149993736,2781312439633, 75460291482772,2206445155886805,69163853027437216, 2313709581153992033,82271226298253976054]