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A065915 as a simple table

na(n)
115
263
315
4255
515
663
715
81023
915
1063
1115
12255
1315
1463
1515
164095
1715
1863
1915
20255
2115
2263
2315
241023
2515
2663
2715
28255
2915
3063
3115
3216383
3315
3463
3515
36255
3715
3863
3915
401023
4115
4263
4315
44255
4515
4663
4715
484095
4915
5063
5115
52255
5315
5463
5515
561023
5715
5863
5915
60255
6115
6263

[15,63,15,255,15,63,15,1023,15,63,15,255,15,63,15,
 4095,15,63,15,255,15,63,15,1023,15,63,15,255,15,
 63,15,16383,15,63,15,255,15,63,15,1023,15,63,15,
 255,15,63,15,4095,15,63,15,255,15,63,15,1023,15,
 63,15,255,15,63]