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 A140183 #4 Mar 30 2012 17:25:28 %S A140183 1,2,2,3,5,1,4,9,4,2,5,14,10,9,1,6,20,20,25,6,2,7,27,35,55,21,13,1,8, %T A140183 35,56,105,56,49,8,2,9,44,84,182,126,140,36,17,1,10,54,120,294,252, %U A140183 336,120,81,10,2,1,65,165,450,462,714,330,285,55,21,1 %N A140183 Triangle read by rows, binomial transform of an infinite lower triangular matrix with (1,2,1,2,1,2,...) in the main diagonal, (1,1,1,...) in the subdiagonal and the rest zeros. %C A140183 Row sums = A052549: (1, 4, 9, 19, 39, 79,...). %F A140183 Triangle read by rows, A007318 as an infinite lower triangular matrix * a bidiagonal matrix with (1,2,1,2,1,2,...) in the main diagonal and (1,1,1,...) in the subdiagonal. %e A140183 First few rows of the triangle are: %e A140183 1; %e A140183 2, 2; %e A140183 3, 5, 1; %e A140183 4, 9, 4, 2; %e A140183 5, 14, 10, 9, 1; %e A140183 6, 20, 20, 25, 6, 2; %e A140183 7, 27, 35, 55, 21, 13, 1; %e A140183 ... %Y A140183 Cf. A052549. %K A140183 nonn,tabl %O A140183 0,2 %A A140183 _Gary W. Adamson_, May 11 2008