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 A130271 #7 Feb 20 2022 14:47:20 %S A130271 1,3,4,5,5,9,7,7,7,16,9,9,9,9,25,11,11,11,11,11,36,13,13,13,13,13,13, %T A130271 49,15,15,15,15,15,15,15,64 %N A130271 Triangle read by rows: A051340^2. %C A130271 Row sums = A003215: (1, 7, 19, 37, 61, 91, 127, ...). %F A130271 The square of A051340 as an infinite lower triangular matrix. %e A130271 First few rows of the triangle: %e A130271 1; %e A130271 3, 4; %e A130271 5, 5, 9; %e A130271 7, 7, 7, 16; %e A130271 9, 9, 9, 9, 25; %e A130271 11, 11, 11, 11, 11, 36; %e A130271 13, 13, 13, 13, 13, 13, 49; %e A130271 ... %Y A130271 Cf. A051340, A003215. %K A130271 nonn,tabl %O A130271 1,2 %A A130271 _Gary W. Adamson_, May 18 2007 %E A130271 Edited by _N. J. A. Sloane_, Jan 05 2009