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 A134247 #6 Mar 25 2022 00:36:08 %S A134247 1,2,1,3,5,1,4,12,9,1,5,22,30,14,1,6,35,70,60,20,1,7,51,135,170,105, %T A134247 27,1,8,70,231,385,350,168,35,1,9,92,364,756,910,644,252,44,1,10,117, %U A134247 540,1344,2016,1890,1092,360,54,1 %N A134247 A007318 * triangle by rows, n-th row = (n-1) zeros followed by T(n), 1. %C A134247 Row sums = A072863: (1, 3, 9, 26, 72, 192, 496, ...). %F A134247 Binomial transform of an infinite lower triangular matrix having n-th row = (n-1) zeros followed by T(n), 1, where T(n) = n-th triangular number. %e A134247 First few rows of the triangle: %e A134247 1; %e A134247 2, 1; %e A134247 3, 5, 1; %e A134247 4, 12, 9, 1; %e A134247 5, 22, 30, 14, 1; %e A134247 6, 35, 70, 60, 20, 1; %e A134247 7, 51, 135, 170, 105, 27, 1; %e A134247 ... %Y A134247 Cf. A072863, A000217. %K A134247 nonn,tabl %O A134247 0,2 %A A134247 _Gary W. Adamson_, Oct 15 2007