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A012491 as a simple table

na(n)
01
11
2-3
3-75
41337
5144105
63933237
7118760733
8129911988593
947180864336337
1013805291952312685
115130037600431416453
122642764719782227835049
131617152674535806453668025

[1,1,-3,-75,1337,144105,3933237,118760733,
 129911988593,47180864336337,13805291952312685,
 5130037600431416453,2642764719782227835049,
 1617152674535806453668025]