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A218281 as a simple table

na(n)
11
23
37
415
531
661
7121
8241
9481
10961
111921
123839
137671
1415327
1530623
1661185
17122249
18244257
19488033
20975105
211948289
223892739
237777807
2415540287
2531049951
2662038717
27123955185
28247666113
29494844193
30988713281
311975478273
323947063807

[1,3,7,15,31,61,121,241,481,961,1921,3839,7671,
 15327,30623,61185,122249,244257,488033,975105,
 1948289,3892739,7777807,15540287,31049951,
 62038717,123955185,247666113,494844193,988713281,
 1975478273,3947063807]