A012872 - OEIS

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A012872 as a simple table

n	a(n)
1	0
2	1
3	-1
4	0
5	-6
6	43
7	-195
8	1568
9	-15204
10	151373
11	-1798245
12	23630992
13	-338936730
14	5409752775
15	-93357461015
16	1736114575232
17	-34849328368680
18	747209331349305
19	-17053712316379593
20	413430901134512288

[0,1,-1,0,-6,43,-195,1568,-15204,151373,-1798245, 23630992,-338936730,5409752775,-93357461015, 1736114575232,-34849328368680,747209331349305, -17053712316379593,413430901134512288]