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A052953 as a simple table

na(n)
02
12
24
36
412
522
644
786
8172
9342
10684
111366
122732
135462
1410924
1521846
1643692
1787382
18174764
19349526
20699052
211398102
222796204
235592406
2411184812
2522369622
2644739244
2789478486
28178956972
29357913942
30715827884
311431655766
322863311532

[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]