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A226618 as a simple table

na(n)
11
25
313
429
511
661
717
8125
9253
10509
11145
12203
131021
1443
152045
1655
174093
18355
191169
208189
21137
223275
2316381
241129
2532765
261007
275957
289361
2965533
30131069
3197
3252427
33262141
34643
3574897
36524285
3741
381048573
39553
4028727
41110375
422097149
43281
44673
452075
469731
4734663

[1,5,13,29,11,61,17,125,253,509,145,203,1021,43,
 2045,55,4093,355,1169,8189,137,3275,16381,1129,
 32765,1007,5957,9361,65533,131069,97,52427,262141,
 643,74897,524285,41,1048573,553,28727,110375,
 2097149,281,673,2075,9731,34663]