A144622 - OEIS

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A144622 as a simple table

n	a(n)
0	1
1	-9
2	7
3	-135
4	594
5	-455
6	-42525
7	451737
8	-883575
9	475475
10	-5740875
11	111234708
12	-396578754
13	493152660
14	-202076875
15	-1856598975
16	56869556085
17	-317970330678
18	672625003050
19	-611386010235
20	201713136625

[1,-9,7,-135,594,-455,-42525,451737,-883575, 475475,-5740875,111234708,-396578754,493152660, -202076875,-1856598975,56869556085,-317970330678, 672625003050,-611386010235,201713136625]