A287886 - OEIS

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A287886 as a simple table

n	a(n)
1	1
2	1
3	4
4	35
5	481
6	9042
7	216077
8	6271057
9	214248958
10	8424002973
11	374708368981
12	18604033129948
13	1019915376831963
14	61193614838857217

[1,1,4,35,481,9042,216077,6271057,214248958, 8424002973,374708368981,18604033129948, 1019915376831963,61193614838857217]