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A279613 as a simple table

na(n)
11
2-7
342
4-231
51155
6-4998
715827
8-791
9-566244
106506955
11-53524611
12369879930
13-2218053747
1411306008875
15-43772711220
1655203364377
171172838094533
18-16542312772356
19150992704165079
20-1130142960861845
217290759457923816

[1,-7,42,-231,1155,-4998,15827,-791,-566244,
 6506955,-53524611,369879930,-2218053747,
 11306008875,-43772711220,55203364377,
 1172838094533,-16542312772356,150992704165079,
 -1130142960861845,7290759457923816]