A012643 - OEIS

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A012643 as a simple table

n	a(n)
0	1
1	1
2	-15
3	225
4	-3423
5	58305
6	-3367023
7	750974497
8	-195722347967
9	56832659001729
10	-19485490128305615
11	8027995798338091873
12	-3957958222909649739039
13	2309625363907160407164225

[1,1,-15,225,-3423,58305,-3367023,750974497, -195722347967,56832659001729,-19485490128305615, 8027995798338091873,-3957958222909649739039, 2309625363907160407164225]