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A266238 as a simple table

na(n)
11
21
39
423
5151
6361
72409
85783
938551
1092521
11616809
121480343
139868951
1423685481
15157903209
16378967703
172526451351
186063483241
1940423221609
2097015731863
21646771545751
221552251709801
2310348344732009
2424836027356823
25165573515712151
26397376437709161

[1,1,9,23,151,361,2409,5783,38551,92521,616809,
 1480343,9868951,23685481,157903209,378967703,
 2526451351,6063483241,40423221609,97015731863,
 646771545751,1552251709801,10348344732009,
 24836027356823,165573515712151,397376437709161]