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 A165661 #2 Mar 30 2012 17:35:24 %S A165661 1,1,1,1,1,1,1,1,1,1,1,1,3,1,1,1,1,2,2,1,1,1,1,5,10,5,1,1,1,1,3,5,5,3, %T A165661 1,1,1,1,7,7,35,7,7,1,1,1,1,4,28,14,14,28,4,1,1,1,1,9,12,21,126,21,12, %U A165661 9,1,1,1,1,5,15,30,42,42,30,15,5,1,1,1,1,11,55,165,66,77,66,165,55,11,1,1 %N A165661 Triangle read by rows: denominator of n/binomial(n,m). %C A165661 First difference from A107711 is at T(10,4) = 21 instead of 42. %F A165661 T(n,m) = binomial(n,m)/gcd(n,binomial(n,m)). %Y A165661 Cf. A159335 (numerators), A107711, A007318, A109004. %K A165661 frac,nonn,tabl %O A165661 0,13 %A A165661 _Franklin T. Adams-Watters_, Sep 24 2009