A022610 - OEIS

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A022610 as a simple table

n	a(n)
0	1
1	-15
2	105
3	-470
4	1590
5	-4593
6	12160
7	-30075
8	69780
9	-153750
10	325728
11	-667020
12	1323915
13	-2557140
14	4824630
15	-8912759
16	16148505
17	-28746945
18	50364835
19	-86956260
20	148098384
21	-249060745
22	413975085
23	-680602545

[1,-15,105,-470,1590,-4593,12160,-30075,69780, -153750,325728,-667020,1323915,-2557140,4824630, -8912759,16148505,-28746945,50364835,-86956260, 148098384,-249060745,413975085,-680602545]