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A183940 as a simple table

na(n)
11
21
311
439
5497
62343
722881
8177535
91682939
1014821961
11149400849
121447662427
1314866001809
14149548074379
151531694916059
1615535552043969
17159929685546853
181644687110377919
1917107437074253385
20178041145616880947

[1,1,11,39,497,2343,22881,177535,1682939,14821961,
 149400849,1447662427,14866001809,149548074379,
 1531694916059,15535552043969,159929685546853,
 1644687110377919,17107437074253385,
 178041145616880947]