A189872 - OEIS

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A189872 as a simple table

n	a(n)
1	1
2	0
3	0
4	2
5	10
6	4
7	12
8	32
9	96
10	144
11	576
12	2280
13	11988
14	47128
15	232756
16	1290772
17	7383588
18	46039788
19	311958088
20	2263575696
21	16975534432

[1,0,0,2,10,4,12,32,96,144,576,2280,11988,47128, 232756,1290772,7383588,46039788,311958088, 2263575696,16975534432]