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A000975 as a simple table

na(n)
00
11
22
35
410
521
642
785
8170
9341
10682
111365
122730
135461
1410922
1521845
1643690
1787381
18174762
19349525
20699050
211398101
222796202
235592405
2411184810
2522369621
2644739242
2789478485
28178956970
29357913941
30715827882
311431655765
322863311530
335726623061
3411453246122

[0,1,2,5,10,21,42,85,170,341,682,1365,2730,5461,
 10922,21845,43690,87381,174762,349525,699050,
 1398101,2796202,5592405,11184810,22369621,
 44739242,89478485,178956970,357913941,715827882,
 1431655765,2863311530,5726623061,11453246122]