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A263506 as a simple table

na(n)
18
248
359
4204
52282
6360
7770
854924
978306
102196
112687
121111442
138349744
142785493
1513704
168559
1720380008
18830632993
191425379543
20101776538
2185189
2225383
23337841109
2477648070968
25714115802545
26255768846517
273683279274
28528559
2971498

[8,48,59,204,2282,360,770,54924,78306,2196,2687,
 1111442,8349744,2785493,13704,8559,20380008,
 830632993,1425379543,101776538,85189,25383,
 337841109,77648070968,714115802545,255768846517,
 3683279274,528559,71498]