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A157771 as a simple table

na(n)
01
1-13
2-87
37787
496657
5-16046173
6-297588807
769866695067
81727090709537
9-521871815056813
10-16125191445423927
115955968624588799947
12220837686566115844017
13-96399932355824952057853
14-4170077652578493188529447
152100371814010915895216050427

[1,-13,-87,7787,96657,-16046173,-297588807,
 69866695067,1727090709537,-521871815056813,
 -16125191445423927,5955968624588799947,
 220837686566115844017,-96399932355824952057853,
 -4170077652578493188529447,
 2100371814010915895216050427]