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A006311 as a simple table

na(n)
2-3
310
4-84
5-10989
6363883
7-82620
8-137550709
9645413252986
10-7142036935967
11-7522164033404415
12-217498966742521653325
13-10590850429623318361311
1414571491290875996179048369
15-5355885371863393108886638462583

[-3,10,-84,-10989,363883,-82620,-137550709,
 645413252986,-7142036935967,-7522164033404415,
 -217498966742521653325,-10590850429623318361311,
 14571491290875996179048369,
 -5355885371863393108886638462583]