A024041 - OEIS

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A024041 as a simple table

n	a(n)
0	1
1	3
2	-16
3	-179
4	-768
5	-2101
6	-3680
7	-423
8	32768
9	203095
10	948576
11	4033253
12	16528384
13	66737571
14	267897632
15	1072982449
16	4293918720
17	17178449327
18	68717587168
19	274875430845
20	1099508427776

[1,3,-16,-179,-768,-2101,-3680,-423,32768,203095, 948576,4033253,16528384,66737571,267897632, 1072982449,4293918720,17178449327,68717587168, 274875430845,1099508427776]