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 A137768 #8 Jun 22 2013 16:06:10 %S A137768 3,5,3,7,7,5,9,31,9,5,11,49,49,11,7,13,71,105,209,71,105,13,7,15,97, %T A137768 351,351,97,15,9,17,127,545,1471,545,127,17,9,19,161,799,2561,2561, %U A137768 799,161,19,11,21,199,495,1121,4159,10625,4159,1121,199,495,21,11 %N A137768 Nontrivial odd numbers in writing first the numerator and then the denominator (left to right) of Leibniz's harmonic-like triangle. %e A137768 1/1; --> %e A137768 1/2, 1/2; --> %e A137768 1/3, 5/6, 1/3; --> 3 5 3 %e A137768 1/4, 7/12, 7/12, 1/4; --> 7 7 %e A137768 1/5, 9/20, 31/30, 9/20, 1/5; --> ... %Y A137768 Cf. A137752. %Y A137768 Cf. A046212, A137752, A137753, A137754, A137755, A137756, A137757, A137758, A137759, A137760, A137761, A137762, A137763, A137764, A137765, A137766, A137767. %K A137768 nonn,tabf,frac,less %O A137768 1,1 %A A137768 _Mohammad K. Azarian_, Feb 13 2008