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A135492 as a simple table

na(n)
12
24
38
416
530
658
7112
8216
9416
10802
111546
122980
135744
1411072
1521342
1641138
1779296
18152848
19294624
20567906
211094674
222110052
234067256
247839888
2515111870
2629129066
2756148080
28108228904
29208617920
30402123970
31775118874
321494089668
332879950432

[2,4,8,16,30,58,112,216,416,802,1546,2980,5744,
 11072,21342,41138,79296,152848,294624,567906,
 1094674,2110052,4067256,7839888,15111870,29129066,
 56148080,108228904,208617920,402123970,775118874,
 1494089668,2879950432]