A024097 - OEIS

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A024097 as a simple table

n	a(n)
0	1
1	7
2	-448
3	-19171
4	-258048
5	-1920357
6	-9815552
7	-38256455
8	-117440512
9	-253202761
10	73741824
11	6231986901
12	63559696384
13	539151314515
14	4377385464320
15	35145928729457
16	281406257233920
17	2251681225808751

[1,7,-448,-19171,-258048,-1920357,-9815552, -38256455,-117440512,-253202761,73741824, 6231986901,63559696384,539151314515,4377385464320, 35145928729457,281406257233920,2251681225808751]