A012515 - OEIS

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A012515 as a simple table

n	a(n)
0	0
1	0
2	2
3	-3
4	12
5	-40
6	-50
7	1449
8	-23016
9	261288
10	-2548262
11	22451165
12	-126287260
13	-685717968
14	42875324518
15	-1054666581255
16	20298673936688
17	-334720477218256
18	4520234227269042
19	-36137161587189411

[0,0,2,-3,12,-40,-50,1449,-23016,261288,-2548262, 22451165,-126287260,-685717968,42875324518, -1054666581255,20298673936688,-334720477218256, 4520234227269042,-36137161587189411]