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A012159 as a simple table

na(n)
01
11
21
32
45
516
661
7216
8937
96400
1041881
11125696
12259181
1318156672
14225924245
15-930421504
16-25529526319
17394852151296
188376428366257
19-97538559528960
20-2542034772205739
2137824762737852416

[1,1,1,2,5,16,61,216,937,6400,41881,125696,259181,
 18156672,225924245,-930421504,-25529526319,
 394852151296,8376428366257,-97538559528960,
 -2542034772205739,37824762737852416]