A012523 - OEIS

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A012523 as a simple table

n	a(n)
0	1
1	0
2	-1
3	-6
4	-23
5	-20
6	743
7	9422
8	64433
9	19032
10	-7391889
11	-131529310
12	-1204724391
13	2412614724
14	343942765463
15	7487171500918
16	80039031954145
17	-547487821933904
18	-48046886269866657
19	-1195424254383765686

[1,0,-1,-6,-23,-20,743,9422,64433,19032,-7391889, -131529310,-1204724391,2412614724,343942765463, 7487171500918,80039031954145,-547487821933904, -48046886269866657,-1195424254383765686]