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A175805 as a simple table

na(n)
021
142
284
3168
4336
5672
61344
72688
85376
910752
1021504
1143008
1286016
13172032
14344064
15688128
161376256
172752512
185505024
1911010048
2022020096
2144040192
2288080384
23176160768
24352321536
25704643072
261409286144
272818572288
285637144576
2911274289152
3022548578304
3145097156608

[21,42,84,168,336,672,1344,2688,5376,10752,21504,
 43008,86016,172032,344064,688128,1376256,2752512,
 5505024,11010048,22020096,44040192,88080384,
 176160768,352321536,704643072,1409286144,
 2818572288,5637144576,11274289152,22548578304,
 45097156608]