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 A128224 #8 Feb 18 2022 22:08:46 %S A128224 1,3,2,5,7,3,7,15,13,4,9,26,34,21,5,11,40,70,65,31,6,13,57,125,155, %T A128224 111,43,7,15,77,203,315,301,175,57,8,17,100,308,574,686,532,260,73,9, %U A128224 19,126,444,966,1386,876,369,91,10 %N A128224 Duplicate of A125026. %C A128224 Row sums = A099035: (1, 5, 15, 39, 95, 223, 511, 1151, ...). %D A128224 A007318 * A127899 (unsigned) as infinite lower triangular matrices. %e A128224 First few rows of the triangle: %e A128224 1; %e A128224 3, 2; %e A128224 5, 7, 3; %e A128224 7, 15, 13, 4; %e A128224 9, 26, 34, 21, 5; %e A128224 11, 40, 70, 65, 31, 6; %e A128224 13, 57, 125, 155, 111, 43, 7; %e A128224 ... %Y A128224 Cf. A007318, A127899, A099035. %K A128224 dead %O A128224 1,2 %A A128224 _Gary W. Adamson_, Feb 19 2007