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A156978 as a simple table

na(n)
01
1-7
2-144
36391
4110736
5-4139527
6-210615984
744156801927
8746983671696
9-50348004077497
10-4257350521714224
11701455303499302261
1235587232523796298256
13-3464786886497430699667
14-410153047417991816658864
15368609279555012342503240759
166233578942096421437956406416

[1,-7,-144,6391,110736,-4139527,-210615984,
 44156801927,746983671696,-50348004077497,
 -4257350521714224,701455303499302261,
 35587232523796298256,-3464786886497430699667,
 -410153047417991816658864,
 368609279555012342503240759,
 6233578942096421437956406416]