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A276238 as a simple table

na(n)
11
25
34097
47361
585073
6658529
73999137
816777217
950281793
1068544541
1172281281
1278202273
13102931841
14128459137
15204786497
16244622261
17336392993
18613750913
19714155969
20785432401
211008179297

[1,5,4097,7361,85073,658529,3999137,16777217,
 50281793,68544541,72281281,78202273,102931841,
 128459137,204786497,244622261,336392993,613750913,
 714155969,785432401,1008179297]