A012511 - OEIS

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A012511 as a simple table

n	a(n)
0	0
1	0
2	2
3	-3
4	12
5	-40
6	310
7	-2331
8	22344
9	-214992
10	2532058
11	-32683915
12	481944980
13	-7585016088
14	130778587966
15	-2420926296075
16	48554376131408
17	-1038765449765536
18	23704180919254962
19	-572815315696075155

[0,0,2,-3,12,-40,310,-2331,22344,-214992,2532058, -32683915,481944980,-7585016088,130778587966, -2420926296075,48554376131408,-1038765449765536, 23704180919254962,-572815315696075155]