A009310 - OEIS

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A009310 as a simple table

n	a(n)
0	0
1	1
2	-2
3	9
4	-51
5	384
6	-3506
7	38126
8	-479770
9	6872392
10	-110410296
11	1967181840
12	-38502498592
13	821352161200
14	-18969587297792
15	471608373782864
16	-12558441874756176
17	356636706706414848
18	-10759204665600245888

[0,1,-2,9,-51,384,-3506,38126,-479770,6872392, -110410296,1967181840,-38502498592,821352161200, -18969587297792,471608373782864, -12558441874756176,356636706706414848, -10759204665600245888]