A012895 - OEIS

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A012895 as a simple table

n	a(n)
0	0
1	2
2	-1
3	17
4	-54
5	933
6	-6870
7	133689
8	-1657880
9	36953013
10	-655575120
11	16777241059
12	-387038985960
13	11324556702587
14	-320046618771152
15	10626198107224309
16	-353798609245392480
17	13212399090164058153

[0,2,-1,17,-54,933,-6870,133689,-1657880,36953013, -655575120,16777241059,-387038985960, 11324556702587,-320046618771152,10626198107224309, -353798609245392480,13212399090164058153]