A012310 - OEIS

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A012310 as a simple table

n	a(n)
0	0
1	0
2	2
3	-3
4	12
5	-40
6	118
7	21
8	-5208
9	88416
10	-904518
11	8456085
12	-36204300
13	-582795720
14	25175931870
15	-566080291035
16	10469521737360
17	-151909726765440
18	1439879949016050
19	12663393759659565
20	-1154176350734965860

[0,0,2,-3,12,-40,118,21,-5208,88416,-904518, 8456085,-36204300,-582795720,25175931870, -566080291035,10469521737360,-151909726765440, 1439879949016050,12663393759659565, -1154176350734965860]