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A130707 as a simple table

na(n)
01
12
22
32
44
510
622
744
886
9170
10340
11682
121366
132732
145462
1510922
1621844
1743690
1887382
19174764
20349526
21699050
221398100
232796202
245592406
2511184812
2622369622
2744739242
2889478484
29178956970
30357913942
31715827884
321431655766
332863311530

[1,2,2,2,4,10,22,44,86,170,340,682,1366,2732,5462,
 10922,21844,43690,87382,174764,349526,699050,
 1398100,2796202,5592406,11184812,22369622,
 44739242,89478484,178956970,357913942,715827884,
 1431655766,2863311530]