A084973 - OEIS

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A084973 as a simple table

n	a(n)
-1	0
0	0
1	0
2	0
3	0
4	0
5	-1
6	4
7	-34
8	374
9	-4988
10	78674
11	-1449689
12	30854707
13	-751125115
14	20736542367
15	-644361764772
16	22387174696660
17	-864494448030320
18	36906142650945649
19	-1733457688501062507
20	89187472319797248472

[0,0,0,0,0,0,-1,4,-34,374,-4988,78674,-1449689, 30854707,-751125115,20736542367,-644361764772, 22387174696660,-864494448030320,36906142650945649, -1733457688501062507,89187472319797248472]