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A015417 as a simple table

na(n)
111
12-90909090909
139182736455455463728191
14-917356289256280909173471073462809
1591744803405968779530929125886960513398447191
16-9174388596710909926545613072877527255280907421320652809

[1,-90909090909,9182736455455463728191,
 -917356289256280909173471073462809,
 91744803405968779530929125886960513398447191,
 -9174388596710909926545613072877527255280907421320\
 652809]