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 A071202 #4 Mar 30 2012 18:51:38 %S A071202 1,1,1,1,1,1,1,2,2,1,1,2,2,2,1,1,3,5,5,3,1,1,3,7,5,7,3,1,1,4,7,14,14, %T A071202 7,4,1,1,4,12,19,14,19,12,4,1,1,5,15,30,42,42,30,15,5,1,1,5,15,30,66, %U A071202 42,66,30,15,5,1,1,6,22,55,99,132,132,99,55,22,6,1,1,6,26,67,143,202,132 %N A071202 Array read by antidiagonals giving number of paths up and left from (0,0) to (n,k) where x/y<n/k (except at start and finish). %F A071202 Some identities: a(n, k)=a(k, n); a(n, m*n)=a(n, m*n-1); a(n, n)=A000108(n-1); if n and k are coprime then a(n, k)=A071201(n, k) %K A071202 nonn,tabl %O A071202 1,8 %A A071202 _Henry Bottomley_, May 16 2002