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 A131767 #4 Oct 05 2012 05:00:41 %S A131767 1,1,1,1,3,1,1,5,4,1,1,7,9,6,1,1,9,16,17,7,1,1,11,25,36,24,9,1,1,13, %T A131767 36,65,60,36,10,1,1,15,49,106,125,102,46,12,1,1,17,64,161,231,237,148, %U A131767 62,13,1 %N A131767 2*A007318 - A065941. %F A131767 2*A007318 - A065941 as infinite lower triangular matrices. %e A131767 First few rows of the triangle are: %e A131767 1; %e A131767 1, 1; %e A131767 1, 3, 1; %e A131767 1, 5, 4, 1; %e A131767 1, 7, 9, 6, 1; %e A131767 1, 9, 16, 17, 7, 1; %e A131767 1, 11, 25, 36, 24, 9, 1; %e A131767 ... %Y A131767 Cf. A007318, A065941, A027934 (row sums). %K A131767 nonn,tabl %O A131767 0,5 %A A131767 _Gary W. Adamson_, Jul 13 2007