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 A046208 #10 Jul 02 2025 16:01:56 %S A046208 1,2,1,3,1,12,1,4,1,20,1,5,1,60,1,30,1,6,1,105,1,42,1,7,1,280,1,168,1, %T A046208 56,1,8,1,504,1,252,1,72,1,9,1,1260,1,840,1,360,1,90,1,10,1,2310,1, %U A046208 1320,1,495,1,110,1,11,1,5544,1,3960,1,1980,1,660,1,132,1,12,1,10296,1 %N A046208 In Leibniz's Harmonic Triangle, write the numerator first and then the denominator of each element to the right of the central elements. %D A046208 L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 83, Problem 25. %Y A046208 Cf. A003506. %K A046208 tabf,nonn,easy %O A046208 1,2 %A A046208 _Mohammad K. Azarian_ %E A046208 More terms from _James Sellers_, Dec 13 1999