A288208 - OEIS

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A288208 as a simple table

n	a(n)
1	0
2	0
3	0
4	2
5	2
6	27
7	214
8	1695
9	15482
10	159019
11	1775664
12	21542628
13	282722448
14	3989526469
15	60239477384
16	969280731152

[0,0,0,2,2,27,214,1695,15482,159019,1775664, 21542628,282722448,3989526469,60239477384, 969280731152]