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 A168533 #3 Mar 30 2012 17:25:35 %S A168533 1,2,1,4,1,1,7,2,1,1,13,2,1,1,1,20,4,2,1,1,1,34,4,2,1,1,1,1,51,7,2,2, %T A168533 1,1,1,1,78,7,4,2,1,1,1,1,1,112,13,4,2,2,2,21,1,1,167,13,4,2,2,1,1,1, %U A168533 1,1,1,230,20,7,4,2,2,21,1,1,1,1,1 %N A168533 Triangle read by rows, A000012 * A168532, as infinite lower triangular matrices. %C A168533 Row sums = A026905: (1, 3, 6, 11, 18, 29, 44, 66,...) %C A168533 Triangle A168534 = A168532 * A000012 %F A168533 Triangle read by rows, A000012 * A168532; where A000012 = an infinite lower %F A168533 triangular matrix with all 1's. The operation takes partial sums of A168532 %F A168533 column terms. %e A168533 First few rows of the triangle = %e A168533 1; %e A168533 2, 1; %e A168533 4, 1, 1; %e A168533 7, 2, 1, 1; %e A168533 13, 2, 1, 1, 1; %e A168533 20, 4, 2, 1, 1, 1; %e A168533 34, 4, 2, 1, 1, 1, 1; %e A168533 51, 7, 2, 2, 1, 1, 1, 1; %e A168533 78, 7, 4, 2, 1, 1, 1, 1, 1; %e A168533 112, 13, 4, 2, 2, 1, 1, 1, 1, 1; %e A168533 167, 13, 4, 2, 2, 1, 1, 1, 1, 1, 1; %e A168533 230, 20, 7, 4, 2, 2, 1, 1, 1, 1, 1, 1; %e A168533 330, 20, 7, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1; %e A168533 449, 34, 7, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1; %e A168533 616, 34, 13, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1; %e A168533 825, 51, 13, 7, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1; %e A168533 1121, 51, 13, 7, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1; %Y A168533 Cf. A168532, A026905, A168534 %K A168533 nonn,tabl %O A168533 1,2 %A A168533 _Gary W. Adamson_, Nov 28 2009