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A278338 as a simple table

na(n)
1561
2561
31105
42465
5561
68911
7561
846657
952633
101729
111105
122465
13561
1446657
15294409
1629341
17512461
181105
19561
201024651
212821
228911
231729
241909001
252821
26162401
271105
282465
29561
3052633
3146657
321729
332465
341729
3510585
3629341
371105
3846657
391193221

[561,561,1105,2465,561,8911,561,46657,52633,1729,
 1105,2465,561,46657,294409,29341,512461,1105,561,
 1024651,2821,8911,1729,1909001,2821,162401,1105,
 2465,561,52633,46657,1729,2465,1729,10585,29341,
 1105,46657,1193221]