A220623 - OEIS

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A220623 as a simple table

n	a(n)
1	1
2	71
3	765
4	17084
5	282777
6	5280827
7	93905509
8	1703300073
9	30648000256
10	553256525421
11	9974206108397
12	179912817659011
13	3244530759637569
14	58516690759430228
15	1055339507419304093
16	19033159346284815815

[1,71,765,17084,282777,5280827,93905509, 1703300073,30648000256,553256525421,9974206108397, 179912817659011,3244530759637569, 58516690759430228,1055339507419304093, 19033159346284815815]