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A205540 as a simple table

na(n)
06
111
221
341
481
5161
6321
7641
81281
92561
105121
1110241
1220471
1334661
1481453
15163601
16327451
17424061
181309739
191517681
205233273
2110482317
2220961533
2320059721
2476468885
25167647487
26332173603
27669748975
281341711425
291018132049
303886817251
313809954797
3213773689903
3342836883235
3482509485265
35171748700625

[6,11,21,41,81,161,321,641,1281,2561,5121,10241,
 20471,34661,81453,163601,327451,424061,1309739,
 1517681,5233273,10482317,20961533,20059721,
 76468885,167647487,332173603,669748975,1341711425,
 1018132049,3886817251,3809954797,13773689903,
 42836883235,82509485265,171748700625]