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A213569 as a simple table

na(n)
11
27
325
471
5181
6435
71009
82287
95101
1011243
1124553
1253223
13114661
14245731
15524257
161114079
172359261
184980699
1910485721
2022020055
2146137301
2296468947
23201326545
24419430351
25872415181
261811939275
273758096329
287784628167

[1,7,25,71,181,435,1009,2287,5101,11243,24553,
 53223,114661,245731,524257,1114079,2359261,
 4980699,10485721,22020055,46137301,96468947,
 201326545,419430351,872415181,1811939275,
 3758096329,7784628167]