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 A131052 #4 Feb 21 2022 00:25:01 %S A131052 1,2,2,4,3,3,8,8,4,4,16,15,15,5,5,32,32,26,26,6,6,64,63,63,42,42,7,7, %T A131052 128,128,120,120,64,64,8,8 %N A131052 A131047 * A000012. %C A131052 Row sums = A087447: (1, 4, 10, 24, 56, ...). A131053 = A000012 * A131047. %F A131052 A131047 * A000012 as infinite lower triangular matrices. %e A131052 First few rows of the triangle: %e A131052 1; %e A131052 2, 2; %e A131052 4, 3, 3; %e A131052 8, 8, 4, 4; %e A131052 16, 15, 15, 5, 5; %e A131052 32, 32, 26, 26, 6, 6; %e A131052 64, 63, 63, 42, 42, 7, 7; %e A131052 ... %Y A131052 Cf. A131047, A087447, A131053. %K A131052 nonn,tabl %O A131052 1,2 %A A131052 _Gary W. Adamson_, Jun 12 2007