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A129961 as a simple table

na(n)
11
22
34
48
515
626
742
864
994
10140
11232
12464
131092
142744
156840
1616384
1737384
1881296
19169120
20338240
21654192
221232288
232280864
244194304
257761376
2614635712
2728384384
2856768768
29116566080
30243472256
31511907712
321073741824
332232713344

[1,2,4,8,15,26,42,64,94,140,232,464,1092,2744,
 6840,16384,37384,81296,169120,338240,654192,
 1232288,2280864,4194304,7761376,14635712,28384384,
 56768768,116566080,243472256,511907712,1073741824,
 2232713344]