A012012 - OEIS

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A012012 as a simple table

n	a(n)
0	1
1	1
2	-3
3	-27
4	1145
5	-8631
6	-1770123
7	115778861
8	4625206001
9	-1652588042607
10	75500754980077
11	36232528294816885
12	-8153373987817082007
13	-655897923302322394919
14	753704651365381460774501

[1,1,-3,-27,1145,-8631,-1770123,115778861, 4625206001,-1652588042607,75500754980077, 36232528294816885,-8153373987817082007, -655897923302322394919,753704651365381460774501]