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A256494 as a simple table

na(n)
10
21
31
42
53
67
713
826
951
10103
11205
12410
13819
141639
153277
166554
1713107
1826215
1952429
20104858
21209715
22419431
23838861
241677722
253355443
266710887
2713421773
2826843546
2953687091
30107374183
31214748365
32429496730
33858993459
341717986919
353435973837
366871947674
3713743895347
3827487790695
3954975581389
40109951162778

[0,1,1,2,3,7,13,26,51,103,205,410,819,1639,3277,
 6554,13107,26215,52429,104858,209715,419431,
 838861,1677722,3355443,6710887,13421773,26843546,
 53687091,107374183,214748365,429496730,858993459,
 1717986919,3435973837,6871947674,13743895347,
 27487790695,54975581389,109951162778]