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 A144157 #4 Feb 08 2022 23:37:36 %S A144157 1,0,1,1,0,1,1,1,0,2,2,1,1,0,4,3,2,1,2,0,8,5,3,2,2,4,0,16,8,5,3,4,4,8, %T A144157 0,32,13,8,5,6,8,8,16,0,64 %N A144157 Eigentriangle, row sums = A011782: (1, 1, 2, 4, 8, 16, ...). %C A144157 Row sums = A011782: (1, 1, 2, 4, 8, 16, ...). %C A144157 Left border = A144157: (1, 0, 1, 1, 2, 3, 5, 8, ...). %C A144157 Sum of n-th row terms = rightmost term of next row. %F A144157 Triangle read by rows, A * B. A = an infinite lower triangular decrescendo subsequences triangle with A144157: (1, 0, 1, 1, 2, 3, 5, 8, ...) in every column; and B = (A011782 * 0^(n-k)), 0 <= k <= n = (1; 0,1; 0,0,2; 0,0,0,4; 0,0,0,0,8; ...). %e A144157 First few rows of the triangle: %e A144157 1; %e A144157 0, 1; %e A144157 1, 0, 1; %e A144157 1, 1, 0, 2; %e A144157 2, 1, 1, 0, 4; %e A144157 3, 2, 1, 2, 0, 8; %e A144157 5, 3, 2, 2, 4, 0, 16; %e A144157 8, 5, 3, 4, 4, 8, 0, 32; %e A144157 13, 8, 5, 6, 8, 8, 16, 0, 64; %e A144157 ... %e A144157 Row 5 = (3, 2, 1, 2, 0, 8) = termwise product of (3, 2, 1, 1, 0, 1) and (1, 1, 1, 2, 4, 8) = (3*1, 2*1, 1*1, 1*2, 0*4, 1*8). %K A144157 nonn,tabl %O A144157 0,10 %A A144157 _Gary W. Adamson_, Sep 12 2008