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A009720 as a simple table

na(n)
01
1-3
2-43
32009
46313
5-9872907
6760322045
7105243758801
8-41122814903471
91873399639193325
103032918686052577317
11-1060046322104258754871
12-196239553045718536023047
13335369132729230015620066021

[1,-3,-43,2009,6313,-9872907,760322045,
 105243758801,-41122814903471,1873399639193325,
 3032918686052577317,-1060046322104258754871,
 -196239553045718536023047,
 335369132729230015620066021]