A012691 - OEIS

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A012691 as a simple table

n	a(n)
0	1
1	1
2	-15
3	57
4	13825
5	-869711
6	-32509455
7	15341387817
8	-1155396011135
9	-466737414209183
10	173446757621320305
11	4992444359346419481
12	-27407671098104949154175
13	8541081671506270503758353

[1,1,-15,57,13825,-869711,-32509455,15341387817, -1155396011135,-466737414209183, 173446757621320305,4992444359346419481, -27407671098104949154175, 8541081671506270503758353]