A009320 - OEIS

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A009320 as a simple table

n	a(n)
0	0
1	1
2	-2
3	10
4	-53
5	373
6	-3289
7	34543
8	-421994
9	5884933
10	-92255061
11	1606210571
12	-30754222080
13	642299748231
14	-14531152719875
15	354020726656465
16	-9240813172692064
17	257285058656341145
18	-7611049992188970105

[0,1,-2,10,-53,373,-3289,34543,-421994,5884933, -92255061,1606210571,-30754222080,642299748231, -14531152719875,354020726656465,-9240813172692064, 257285058656341145,-7611049992188970105]