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 A137755 #7 Jun 22 2013 16:06:10 %S A137755 5,7,7,9,31,9,11,49,49,11,13,71,209,71,13,15,97,351,351,97,15,17,127, %T A137755 545,1471,545,127,17,19,161,799,2561,2561,799,161,19,21,199,1121,4159, %U A137755 10625,4159,1121,199,21 %N A137755 Nontrivial numerators (left to right) of Leibniz's harmonic-like triangle. %e A137755 1/1; --> %e A137755 1/2, 1/2; --> %e A137755 1/3, 5/6, 1/3; --> 5 %e A137755 1/4, 7/12, 7/12, 1/4; --> 7 7 %e A137755 1/5, 9/20, 31/30, 9/20, 1/5; --> 9 31 9 %Y A137755 Cf. A003506; A007622; A046201; A046204; A046205; A046206; A046208; A046212; A137752; A137753; A137754. %K A137755 frac,nonn,tabl %O A137755 1,1 %A A137755 _Mohammad K. Azarian_, Feb 10 2008