A012699 - OEIS

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A012699 as a simple table

n	a(n)
0	0
1	0
2	2
3	-3
4	16
5	-50
6	488
7	-3024
8	35376
9	-313704
10	4361472
11	-52901640
12	869275680
13	-13360922640
14	252154734960
15	-4681650438360
16	100596004131840
17	-2186713427586240
18	52870374675586560
19	-1312523172135192960

[0,0,2,-3,16,-50,488,-3024,35376,-313704,4361472, -52901640,869275680,-13360922640,252154734960, -4681650438360,100596004131840,-2186713427586240, 52870374675586560,-1312523172135192960]