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A012763 as a simple table

na(n)
01
10
2-1
33
4-18
560
6-60
7-1890
831472
9-319032
102369280
11-6374280
12-209401368
135594400240
14-90523285944
151016295254520
16-3922383447232
17-184920315173888
186878045401558272
19-151394798389814208

[1,0,-1,3,-18,60,-60,-1890,31472,-319032,2369280,
 -6374280,-209401368,5594400240,-90523285944,
 1016295254520,-3922383447232,-184920315173888,
 6878045401558272,-151394798389814208]