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 A125170 #12 Feb 14 2022 03:54:56 %S A125170 1,2,1,5,3,1,14,8,4,1,41,22,12,5,1,122,63,34,17,6,1,365,185,97,51,23, %T A125170 7,1,1094,550,282,148,74,30,8,1,3281,1644,832,430,222,104,38,9,1 %N A125170 Binomial transform of an infinite lower triangular matrix with (1,1,2,4,8,...) in every column and the rest zeros. Let the left column = A007051, then for k > 1, T(n,k) = (n-1,k) + (n-1,k-1). %e A125170 (5,3) = 34 = 12 + 22 = (4,3) + (4,2). %e A125170 First few rows of the triangle: %e A125170 1; %e A125170 2, 1; %e A125170 5, 3, 1; %e A125170 14, 8, 4, 1; %e A125170 41, 22, 12, 5, 1; %e A125170 122, 63, 34, 17, 6, 1; %e A125170 ... %Y A125170 Cf. A000244 (row sums), A007051 (left border). %K A125170 nonn,tabl %O A125170 0,2 %A A125170 _Gary W. Adamson_, Nov 22 2006 %E A125170 Edited by _N. J. A. Sloane_, Oct 07 200