A013009 - OEIS

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A013009 as a simple table

n	a(n)
0	0
1	1
2	-3
3	10
4	-55
5	393
6	-3485
7	36923
8	-455306
9	6408445
10	-101402557
11	1782112451
12	-34444583072
13	726178939315
14	-16584396680007
15	407872396640525
16	-10747394439586016
17	302068718096449161
18	-9020579413121532169

[0,1,-3,10,-55,393,-3485,36923,-455306,6408445, -101402557,1782112451,-34444583072,726178939315, -16584396680007,407872396640525, -10747394439586016,302068718096449161, -9020579413121532169]