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A262267 as a simple table

na(n)
12
24
37
413
526
652
7103
8205
9410
10820
111639
123277
136554
1413108
1526215
1652429
17104858
18209716
19419431
20838861
211677722
223355444
236710887
2413421773
2526843546
2653687092
27107374183
28214748365
29429496730
30858993460
311717986919
323435973837

[2,4,7,13,26,52,103,205,410,820,1639,3277,6554,
 13108,26215,52429,104858,209716,419431,838861,
 1677722,3355444,6710887,13421773,26843546,
 53687092,107374183,214748365,429496730,858993460,
 1717986919,3435973837]