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 A131828 #6 Mar 04 2022 01:27:24 %S A131828 1,6,4,14,5,9,25,7,7,16,39,9,9,9,25,56,11,11,11,11,36,76,13,13,13,13, %T A131828 13,49,99,15,15,15,15,15,15,64,125,17,17,17,17,17,17,17,81,154,19,19, %U A131828 19,19,19,19,19,19,100 %N A131828 Square of lower triangular matrix in A131821, read by rows. %C A131828 Left column = A095794: (1, 6, 14, 25, 39, 56, ...). %C A131828 Row sums = A060544: (1, 10, 28, 55, 91, 190, ...). %F A131828 A131821^2. %e A131828 First few rows of the triangle: %e A131828 1; %e A131828 6, 4; %e A131828 14, 5, 9; %e A131828 25, 7, 7, 16; %e A131828 39, 9, 9, 9, 25; %e A131828 56, 11, 11, 11, 11, 36; %e A131828 76, 13, 13, 13, 13, 13, 49; %e A131828 ... %Y A131828 Cf. A131821, A095794, A060544. %K A131828 nonn,tabl %O A131828 1,2 %A A131828 _Gary W. Adamson_, Jul 20 2007