A131751 - OEIS

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A131751 as a simple table

n	a(n)
1	1
2	31
3	1891
4	117181
5	7263301
6	450207451
7	27905598631
8	1729696907641
9	107213302675081
10	6645495068947351
11	411913480972060651
12	25531990325198812981
13	1582571486681354344141
14	98093900183918770523731

[1,31,1891,117181,7263301,450207451,27905598631, 1729696907641,107213302675081,6645495068947351, 411913480972060651,25531990325198812981, 1582571486681354344141,98093900183918770523731]