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A012664 as a simple table

na(n)
00
12
2-12
322
46888
5-422998
6-19858212
710668149182
8-1244673483312
9-393680785867438
10254550574752219588
11-30031176795810056858
12-50358282178393089181512
1338448631613848702263196922

[0,2,-12,22,6888,-422998,-19858212,10668149182,
 -1244673483312,-393680785867438,
 254550574752219588,-30031176795810056858,
 -50358282178393089181512,
 38448631613848702263196922]