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A178956 as a simple table

na(n)
01
1-1
20
31
41
5-1
6-7
7-13
8169
9233
1017
11-18847
12-43957
1326023
14429007
1531505483
16-31381783
17-753299101
18-7372705283
19195152846389
20632396244331
21-52258919107
22-447065769153911
23-13584264183406001
2434831349327448893
25674219621951483119
262113978805943481381
27-6602691591860999071
28-370308752490094361609
29-95867348590727618473
30752151788353653780085507

[1,-1,0,1,1,-1,-7,-13,169,233,17,-18847,-43957,
 26023,429007,31505483,-31381783,-753299101,
 -7372705283,195152846389,632396244331,
 -52258919107,-447065769153911,-13584264183406001,
 34831349327448893,674219621951483119,
 2113978805943481381,-6602691591860999071,
 -370308752490094361609,-95867348590727618473,
 752151788353653780085507]