A213152 - OEIS

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A213152 as a simple table

n	a(n)
0	1
1	-7
2	-21
3	917
4	11571
5	-452347
6	-13308141
7	435327557
8	25765086291
9	-624624700987
10	-74611975175661
11	990632591644997
12	299140108182963411
13	249897499717445573
14	-1569672873030414985581
15	-30079222140754781400763

[1,-7,-21,917,11571,-452347,-13308141,435327557, 25765086291,-624624700987,-74611975175661, 990632591644997,299140108182963411, 249897499717445573,-1569672873030414985581, -30079222140754781400763]