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A135493 as a simple table

na(n)
12
24
38
416
532
662
7122
8240
9472
10928
111824
123586
137050
1413860
1527248
1653568
17105312
18207038
19407026
20800192
211573136
223092704
236080096
2411953154
2523499282
2646198372
2790823608
28178554512
29351028928
30690104702
311356710122
322667221872

[2,4,8,16,32,62,122,240,472,928,1824,3586,7050,
 13860,27248,53568,105312,207038,407026,800192,
 1573136,3092704,6080096,11953154,23499282,
 46198372,90823608,178554512,351028928,690104702,
 1356710122,2667221872]