A022253 - OEIS

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A022253 as a simple table

n	a(n)
2	1
3	91
4	7462
5	605242
6	49031983
7	3971657053
8	321704819164
9	26058095733124
10	2110705802810605
11	170967170463507055
12	13848340811466703906
13	1121715605764106708446
14	90858964067210376612667
15	7359576089446900104682897

[1,91,7462,605242,49031983,3971657053, 321704819164,26058095733124,2110705802810605, 170967170463507055,13848340811466703906, 1121715605764106708446,90858964067210376612667, 7359576089446900104682897]