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A374527 as a simple table

na(n)
11
221
385
4151
5227
6341
71365
85461
914563
1021845
1187381
12349525
13932067
141398101
155592405
1622369621
1726512143
1839768215
1959652323
2089478485
21357913941
221431655765
233817748707
245726623061

[1,21,85,151,227,341,1365,5461,14563,21845,87381,
 349525,932067,1398101,5592405,22369621,26512143,
 39768215,59652323,89478485,357913941,1431655765,
 3817748707,5726623061]