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 A134444 #6 Mar 25 2022 00:33:49 %S A134444 1,1,1,3,1,1,3,3,1,1,5,3,3,1,1,5,5,3,3,1,1,7,5,5,3,3,1,1,7,7,5,5,3,3, %T A134444 1,1,9,7,7,5,5,3,3,1,1,9,9,7,7,5,5,3,3,1,1 %N A134444 (A000012 * A128174 + A128174 * A000012) - A000012. %C A134444 Row sums = A000982: (1, 2, 5, 8, 13, 18, 25, ...). %F A134444 (A000012 * A128174 + A128174 * A000012) - A000012, as infinite lower triangular matrices. Triangle read by rows, n-th row = n terms of odd numbers repeated, starting from the right. %e A134444 First few rows of the triangle: %e A134444 1; %e A134444 1, 1; %e A134444 3, 1, 1; %e A134444 3, 3, 1, 1; %e A134444 5, 3, 3, 1, 1; %e A134444 5, 5, 3, 3, 1, 1; %e A134444 ... %Y A134444 Cf. A128174, A000012, A000982. %K A134444 nonn,tabl %O A134444 0,4 %A A134444 _Gary W. Adamson_, Oct 25 2007