A024231 - OEIS

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A024231 as a simple table

n	a(n)
0	0
1	1
2	-2
3	-21
4	-228
5	5077
6	631834
7	37060863
8	791278008
9	-198249695063
10	-43572627802442
11	-5264284574193645
12	-189769141997109804
13	100566175129622055037
14	26413749605638836403666

[0,1,-2,-21,-228,5077,631834,37060863,791278008, -198249695063,-43572627802442,-5264284574193645, -189769141997109804,100566175129622055037, 26413749605638836403666]