A221939 - OEIS

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A221939 as a simple table

n	a(n)
1	1
2	91
3	1599
4	36467
5	799632
6	17595404
7	387146025
8	8517616158
9	187399250327
10	4123030670649
11	90712135220235
12	1995786856338823
13	43909951229853113
14	966076992787974879
15	21254971544597958477
16	467637484141672483673

[1,91,1599,36467,799632,17595404,387146025, 8517616158,187399250327,4123030670649, 90712135220235,1995786856338823,43909951229853113, 966076992787974879,21254971544597958477, 467637484141672483673]