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A012294 as a simple table

na(n)
01
10
2-1
3-6
4-15
560
61023
76062
8-9247
9-652680
10-7332289
11-13792350
12994947921
1319248140340
14119312444223
15-2747842718122
16-91993600741951
17-1070543140984080
1810423240065585023
19710021632610736714

[1,0,-1,-6,-15,60,1023,6062,-9247,-652680,
 -7332289,-13792350,994947921,19248140340,
 119312444223,-2747842718122,-91993600741951,
 -1070543140984080,10423240065585023,
 710021632610736714]