A012887 - OEIS

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A012887 as a simple table

n	a(n)
0	1
1	2
2	3
3	3
4	-3
5	-23
6	-51
7	35
8	665
9	2017
10	-2311
11	-45133
12	-146091
13	387025
14	5568437
15	15639707
16	-99321807
17	-1058587839
18	-1821476879
19	34121660131
20	274379440173
21	-74418715727
22	-14824670374547
23	-86166831190837

[1,2,3,3,-3,-23,-51,35,665,2017,-2311,-45133, -146091,387025,5568437,15639707,-99321807, -1058587839,-1821476879,34121660131,274379440173, -74418715727,-14824670374547,-86166831190837]