This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A131135 #9 Sep 13 2019 09:12:36 %S A131135 1,2,8,24,64,160,128,896,2048,4608,10240,22528,16384,106496,229376, %T A131135 491520,1048576,2228224,524288,9961472,4194304,6291456,92274688, %U A131135 192937984,134217728,838860800,1744830464,3623878656,7516192768 %N A131135 Denominator of (ordinary) expansion of log((x/2-1)/(x-1)). %F A131135 a(n) = 2*A090634(n) for n > 0. %F A131135 a(n) = denominator((1-1/2^n)/n), for n > 0, conjectured. - _Michel Marcus_, Sep 12 2019 %Y A131135 Cf. A090634, A131136. %K A131135 easy,nonn %O A131135 0,2 %A A131135 _Paul Barry_, Jun 17 2007