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A012554 as a simple table

na(n)
01
12
28
3110
4520
580458
6-4654604
7820778478
8-157200016272
941164154565906
10-13482969489167252
115454988601609663734
12-2666562535164656750936
131549911678027846498248986
14-1056435556882844258622185948
15834565745980558555804948223614

[1,2,8,110,520,80458,-4654604,820778478,
 -157200016272,41164154565906,-13482969489167252,
 5454988601609663734,-2666562535164656750936,
 1549911678027846498248986,
 -1056435556882844258622185948,
 834565745980558555804948223614]