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A277002 as a simple table

na(n)
1-1
27
3-31
4127
5-511
61414477
7-8191
8118518239
9-5749691557
1091546277357
11-23273283019
121982765468311237
13-22076500342261
14455371239541065869
15-925118910976041358111
1616555640865486520478399
17-1302480594081611886641
18904185845619475242495834469891

[-1,7,-31,127,-511,1414477,-8191,118518239,
 -5749691557,91546277357,-23273283019,
 1982765468311237,-22076500342261,
 455371239541065869,-925118910976041358111,
 16555640865486520478399,-1302480594081611886641,
 904185845619475242495834469891]