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A077870 as a simple table

na(n)
01
12
23
32
4-1
5-6
6-9
7-6
87
926
1039
1126
12-25
13-102
14-153
15-102
16103
17410
18615
19410
20-409
21-1638
22-2457
23-1638
241639
256554
269831
276554
28-6553
29-26214
30-39321
31-26214
3226215
33104858
34157287
35104858
36-104857
37-419430
38-629145
39-419430
40419431
411677722
422516583
431677722
44-1677721
45-6710886

[1,2,3,2,-1,-6,-9,-6,7,26,39,26,-25,-102,-153,
 -102,103,410,615,410,-409,-1638,-2457,-1638,1639,
 6554,9831,6554,-6553,-26214,-39321,-26214,26215,
 104858,157287,104858,-104857,-419430,-629145,
 -419430,419431,1677722,2516583,1677722,-1677721,
 -6710886]