A009444 - OEIS

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A009444 as a simple table

n	a(n)
0	0
1	1
2	-3
3	11
4	-58
5	409
6	-3606
7	38149
8	-470856
9	6641793
10	-105398650
11	1858413061
12	-36044759796
13	762659322385
14	-17481598316742
15	431535346662645
16	-11413394655983536
17	321989729198400385
18	-9651573930139850610

[0,1,-3,11,-58,409,-3606,38149,-470856,6641793, -105398650,1858413061,-36044759796,762659322385, -17481598316742,431535346662645, -11413394655983536,321989729198400385, -9651573930139850610]