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A247565 as a simple table

na(n)
02
13
23
31
4-1
59
663
7217
8527
9969
101311
111081
1247
13-87
147743
1539961
16121679
17270729
18456543
19548857
20344687
21-112791
22380031
235785561
2424225167
2566310473
26135585183
27208622521
28217744559
2987179049
30-72570177
31507315097
323959709647
3314144835849
3435185603551

[2,3,3,1,-1,9,63,217,527,969,1311,1081,47,-87,
 7743,39961,121679,270729,456543,548857,344687,
 -112791,380031,5785561,24225167,66310473,
 135585183,208622521,217744559,87179049,-72570177,
 507315097,3959709647,14144835849,35185603551]