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A156220 as a simple table

na(n)
0-2
1-2
23
3-2
43
5-1
6-2
73
8-1
9109
10-2
113
12-1
13325
141555523
15-2
163
17-1
18973
1932671835
2049621794478165
21-2
223
23-1
242917
25686126051
2615630874866123949
2727744919164118690798376051
28-2
293
30-1
318749
3214408699579
334923725784550050421
34270929135785330782929292449579
352134369240927848351630724472718209102550421

[-2,-2,3,-2,3,-1,-2,3,-1,109,-2,3,-1,325,1555523,
 -2,3,-1,973,32671835,49621794478165,-2,3,-1,2917,
 686126051,15630874866123949,
 27744919164118690798376051,-2,3,-1,8749,
 14408699579,4923725784550050421,
 270929135785330782929292449579,
 2134369240927848351630724472718209102550421]