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A295913 as a simple table

na(n)
15
213
339
4115
5337
6993
72919
88587
925257
1074289
11218511
12642715
131890449
145560465
1516355255
1648106475
17141497817
18416194129
191224171199
203600711835
2110590941633
2231151630513
2391627743527
24269508954923
25792719257161
262331662118065

[5,13,39,115,337,993,2919,8587,25257,74289,218511,
 642715,1890449,5560465,16355255,48106475,
 141497817,416194129,1224171199,3600711835,
 10590941633,31151630513,91627743527,269508954923,
 792719257161,2331662118065]