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A014113 as a simple table

na(n)
00
12
22
36
410
522
642
786
8170
9342
10682
111366
122730
135462
1410922
1521846
1643690
1787382
18174762
19349526
20699050
211398102
222796202
235592406
2411184810
2522369622
2644739242
2789478486
28178956970
29357913942
30715827882
311431655766
322863311530
335726623062
3411453246122

[0,2,2,6,10,22,42,86,170,342,682,1366,2730,5462,
 10922,21846,43690,87382,174762,349526,699050,
 1398102,2796202,5592406,11184810,22369622,
 44739242,89478486,178956970,357913942,715827882,
 1431655766,2863311530,5726623062,11453246122]