A012763 - OEIS

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A012763 as a simple table

n	a(n)
0	1
1	0
2	-1
3	3
4	-18
5	60
6	-60
7	-1890
8	31472
9	-319032
10	2369280
11	-6374280
12	-209401368
13	5594400240
14	-90523285944
15	1016295254520
16	-3922383447232
17	-184920315173888
18	6878045401558272
19	-151394798389814208

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