A245519 - OEIS

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A245519 as a simple table

n	a(n)
1	0
2	0
3	0
4	2
5	10
6	64
7	336
8	1872
9	11104
10	71944
11	508032
12	3511232
13	27192704
14	223750464
15	1947253504
16	17899536448
17	173156535168
18	1760383827776
19	18752453106176
20	209034916385472
21	2432351796434560
22	29509268795249700

[0,0,0,2,10,64,336,1872,11104,71944,508032, 3511232,27192704,223750464,1947253504,17899536448, 173156535168,1760383827776,18752453106176, 209034916385472,2432351796434560, 29509268795249700]