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A001648 as a simple table

na(n)
11
23
37
415
526
651
799
8191
9367
10708
111365
122631
135071
149775
1518842
1636319
1770007
18134943
19260111
20501380
21966441
221862875
233590807
246921503
2513341626
2625716811
2749570747
2895550687
29184179871
30355018116
31684319421
321319068095
332542585503
344900991135

[1,3,7,15,26,51,99,191,367,708,1365,2631,5071,
 9775,18842,36319,70007,134943,260111,501380,
 966441,1862875,3590807,6921503,13341626,25716811,
 49570747,95550687,184179871,355018116,684319421,
 1319068095,2542585503,4900991135]