A166680 - OEIS

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A166680 as a simple table

n	a(n)
0	1
1	-3
2	-14
3	-54
4	-232
5	-1180
6	-7104
7	-49756
8	-398080
9	-3582756
10	-35827600
11	-394103644
12	-4729243776
13	-61480169140
14	-860722368016
15	-12910835520300
16	-206573368324864
17	-3511747261522756
18	-63211450707409680

[1,-3,-14,-54,-232,-1180,-7104,-49756,-398080, -3582756,-35827600,-394103644,-4729243776, -61480169140,-860722368016,-12910835520300, -206573368324864,-3511747261522756, -63211450707409680]