A307052 - OEIS

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A307052 as a simple table

n	a(n)
1	5
2	17
3	80
4	257
5	1280
6	4352
7	8060
8	65537
9	327680
10	1065220
11	1089452
12	1114112
13	16842752
14	100340800
15	383479200
16	466344000000

[5,17,80,257,1280,4352,8060,65537,327680,1065220, 1089452,1114112,16842752,100340800,383479200, 466344000000]