A306292 - OEIS

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A306292 as a simple table

n	a(n)
1	0
2	0
3	2
4	8
5	32
6	112
7	394
8	1360
9	4736
10	16544
11	58324
12	207088
13	741184
14	2671008
15	9688410
16	35344800
17	129620480
18	477590080
19	1767170812
20	6563935664
21	24465914304
22	91481858208
23	343058261572
24	1289901443168

[0,0,2,8,32,112,394,1360,4736,16544,58324,207088, 741184,2671008,9688410,35344800,129620480, 477590080,1767170812,6563935664,24465914304, 91481858208,343058261572,1289901443168]