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