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 A130322 #4 Feb 20 2022 14:55:04 %S A130322 1,4,1,12,4,1,32,12,4,1,80,32,12,4,1,192,80,32,12,4,1,448,192,80,32, %T A130322 12,4,1,1024,448,192,80,32,12,4,1,2304,1024,448,192,80,32,12,4,1 %N A130322 A130321^2. %C A130322 Row sums = A000337: (1, 5, 17, 49, 129, 321, ...). %F A130322 The square of triangle A130321 as an infinite lower triangular matrix. %F A130322 A001787 in every column starting (1, 4, 12, 32, 80, 192, ...). %e A130322 First few rows of the triangle: %e A130322 1; %e A130322 4, 1; %e A130322 12, 4, 1; %e A130322 32, 12, 4, 1; %e A130322 80, 32, 12, 4, 1; %e A130322 192, 80, 32, 12, 4, 1; %e A130322 ... %Y A130322 Cf. A130321, A001787, A000337. %K A130322 nonn,tabl %O A130322 0,2 %A A130322 _Gary W. Adamson_, May 24 2007