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A293331 as a simple table

na(n)
02
14
28
317
435
571
6143
7286
8572
91144
102289
114579
129158
1318317
1436635
1573271
16146542
17293085
18586171
191172343
202344687
214689374
229378748
2318757497
2437514995
2575029990
26150059981
27300119963
28600239927
291200479854
302400959708
314801919417
329603838834

[2,4,8,17,35,71,143,286,572,1144,2289,4579,9158,
 18317,36635,73271,146542,293085,586171,1172343,
 2344687,4689374,9378748,18757497,37514995,
 75029990,150059981,300119963,600239927,1200479854,
 2400959708,4801919417,9603838834]