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A099060 as a simple table

na(n)
1-24
2-1472
3-6048
484480
5-115920
6-370944
7401856
8987136
92727432
10-7109760
11-12830688
1221288960
1313865712
1424647168
15-29211840
16-196706304
17165742416
18167282496
19-255874080
20408038400
21101267712
22-786948864
23-447438528
24248758272
25611981400
26850430336
271758697920

[-24,-1472,-6048,84480,-115920,-370944,401856,
 987136,2727432,-7109760,-12830688,21288960,
 13865712,24647168,-29211840,-196706304,165742416,
 167282496,-255874080,408038400,101267712,
 -786948864,-447438528,248758272,611981400,
 850430336,1758697920]