A013459 - OEIS

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A013459 as a simple table

n	a(n)
0	1
1	0
2	1
3	-4
4	9
5	-40
6	385
7	-2700
8	15505
9	-145360
10	1886625
11	-19796500
12	190881625
13	-2654379000
14	44269902625
15	-625468889500
16	8553276590625
17	-156119043652000
18	3194978818578625
19	-57041478987070500

[1,0,1,-4,9,-40,385,-2700,15505,-145360,1886625, -19796500,190881625,-2654379000,44269902625, -625468889500,8553276590625,-156119043652000, 3194978818578625,-57041478987070500]