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 A135856 #12 Jul 26 2023 21:09:31 %S A135856 1,5,1,9,6,1,13,15,7,1,17,28,22,8,1,21,45,50,30,9,1,25,66,95,80,39,10, %T A135856 1,29,91,161,175,119,49,11,1,33,120,252,336,294,168,60,12,1,37,153, %U A135856 372,588,630,462,228,72,13,1 %N A135856 A007318 * a bidiagonal matrix with all 1's in the main diagonal and all 4's in the subdiagonal. %C A135856 Row sums = A048487. %C A135856 When the first column is removed from this triangle, the result is A125233. - _Georg Fischer_, Jul 26 2023 %F A135856 Binomial transform of an infinite lower triangular matrix with all 1's in the main diagonal and all 4's in the subdiagonal (by columns, (1, 4, 0, 0, 0, ...) in every column. %e A135856 First few rows of the triangle: %e A135856 1; %e A135856 5, 1; %e A135856 9, 6, 1; %e A135856 13, 15, 7, 1; %e A135856 17, 28, 22, 8, 1; %e A135856 21, 45, 50, 30, 9, 1; %e A135856 25, 66, 95, 80, 39, 10, 1; %e A135856 ... %Y A135856 Cf. A048487, A125233. %K A135856 nonn,tabl %O A135856 1,2 %A A135856 _Gary W. Adamson_, Dec 01 2007