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A128209 as a simple table

na(n)
01
12
22
34
46
512
622
744
886
9172
10342
11684
121366
132732
145462
1510924
1621846
1743692
1887382
19174764
20349526
21699052
221398102
232796204
245592406
2511184812
2622369622
2744739244
2889478486
29178956972
30357913942
31715827884
321431655766
332863311532
345726623062

[1,2,2,4,6,12,22,44,86,172,342,684,1366,2732,5462,
 10924,21846,43692,87382,174764,349526,699052,
 1398102,2796204,5592406,11184812,22369622,
 44739244,89478486,178956972,357913942,715827884,
 1431655766,2863311532,5726623062]