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A276647 as a simple table

na(n)
01
13
27
315
431
559
6107
7183
8303
9483
10755
111151
121735
132571
143787
155511
167999
1711507
1816547
1923631
2033783
2148027
2268411
2396983
24137839
25195075
26276883
27391455
28555175
29784427
301111979
311570599
322225823
333143187
344453763
356288623
368909911
3712579771

[1,3,7,15,31,59,107,183,303,483,755,1151,1735,
 2571,3787,5511,7999,11507,16547,23631,33783,48027,
 68411,96983,137839,195075,276883,391455,555175,
 784427,1111979,1570599,2225823,3143187,4453763,
 6288623,8909911,12579771]