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A009021 as a simple table

na(n)
01
10
2-1
33
4-18
5100
6-726
75698
8-52028
9522720
10-5849876
1171473468
12-951628488
1313674233040
14-211091632376
153478906531688
16-60920066577648
171127785660994560
18-21969631512312976
19448167387287730608

[1,0,-1,3,-18,100,-726,5698,-52028,522720,
 -5849876,71473468,-951628488,13674233040,
 -211091632376,3478906531688,-60920066577648,
 1127785660994560,-21969631512312976,
 448167387287730608]