A146280 - OEIS

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A146280 as a simple table

n	a(n)
1	1
2	1
3	5
4	17
5	37
6	109
7	2661
8	46501
9	480069
10	5729689
11	346242155
12	24356919567
13	1272792100111
14	72738009625423
15	11858558725473199
16	2972962662671644607
17	716003950107687603735

[1,1,5,17,37,109,2661,46501,480069,5729689, 346242155,24356919567,1272792100111, 72738009625423,11858558725473199, 2972962662671644607,716003950107687603735]