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A022716 as a simple table

na(n)
01
1-24
2252
3-1520
45982
5-18240
657320
7-198192
8604389
9-1567840
104210116
11-12229632
1232349958
13-77844000
14196563240
15-510760752
161233110610
17-2871650184
186899741020
19-16499031456
2037934952672
21-86122235648

[1,-24,252,-1520,5982,-18240,57320,-198192,604389,
 -1567840,4210116,-12229632,32349958,-77844000,
 196563240,-510760752,1233110610,-2871650184,
 6899741020,-16499031456,37934952672,-86122235648]