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 A134699 #11 Apr 29 2025 13:38:12 %S A134699 1,3,1,3,1,1,6,3,1,1,3,1,1,1,1,9,5,3,1,1,1,3,1,1,1,1,1,1,10,6,3,3,1,1, %T A134699 1,1,6,3,3,1,1,1,1,1,1,9,5,3,3,3,1,1,1,1,1,3,1,1,1,1,1,1,1,1,1,1,18, %U A134699 12,8,5,3,3,1,1,1,1,1,1,3,1,1,1,1,1,1,1,1,1,1,1,1 %N A134699 Triangle read by rows: A051731^2 * A000012. %C A134699 Left column = A007425. %C A134699 Row sums = A007429: (1, 4, 5, 11, 7, 20, ...). %C A134699 A134700 = A000012 * A127170. %F A134699 A051731^2 * A000012 = A127170 * A000012, as infinite lower triangular matrices. %e A134699 First few rows of the triangle: %e A134699 1; %e A134699 3, 1; %e A134699 3, 1, 1; %e A134699 6, 3, 1, 1; %e A134699 3, 1, 1, 1, 1; %e A134699 9, 5, 3, 1, 1, 1; %e A134699 3, 1, 1, 1, 1, 1, 1; %e A134699 10, 6, 3, 3, 1, 1, 1, 1; %e A134699 ... %Y A134699 Cf. A007425, A007429, A051731, A127170, A134700. %K A134699 nonn,tabl %O A134699 1,2 %A A134699 _Gary W. Adamson_, Nov 06 2007 %E A134699 More terms from _Jinyuan Wang_, Apr 29 2025