A180154 - OEIS

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A180154 as a simple table

n	a(n)
2	2
3	4
4	8
5	36
6	160
7	848
8	5792
9	41712
10	338688
11	2902464
12	30968064
13	346316544
14	4034119680
15	48892557312
16	707976364032

[2,4,8,36,160,848,5792,41712,338688,2902464, 30968064,346316544,4034119680,48892557312, 707976364032]