A009413 - OEIS

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A009413 as a simple table

n	a(n)
0	0
1	1
2	-1
3	5
4	-12
5	69
6	-285
7	1833
8	-11536
9	91689
10	-782865
11	7685325
12	-82339884
13	973147629
14	-12466581309
15	172666976433
16	-2565893101440
17	40742019960785
18	-688062399893505
19	12315242802523797
20	-232832786354392620

[0,1,-1,5,-12,69,-285,1833,-11536,91689,-782865, 7685325,-82339884,973147629,-12466581309, 172666976433,-2565893101440,40742019960785, -688062399893505,12315242802523797, -232832786354392620]