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 A158948 #8 Feb 08 2022 23:12:11 %S A158948 1,1,1,2,0,1,2,1,0,1,3,0,1,0,1,3,1,0,1,0,1,4,0,1,0,1,0,1,4,1,0,1,0,1, %T A158948 0,1,5,0,1,0,1,0,1,0,1,5,1,0,1,0,1,0,1,0,1 %N A158948 Triangle read by rows, left border = natural numbers repeated (1, 1, 2, 2, 3, 3, ...); all other columns = (1, 0, 1, 0, 1, 0, ...). %C A158948 Row sums = n. Eigensequence of the triangle = nonzero terms of A000071: (1, 2, 4, 7, 12, 20, ...) = ((F3 - 1), (F4 - 1), (F5 - 1), ...). %F A158948 Triangle by rows, left border = natural numbers repeated (1, 1, 2, 2, 3, 3, ...); all other columns = (1, 0, 1, 0, 1, 0, ...). %e A158948 First few rows of the triangle: %e A158948 1; %e A158948 1, 1; %e A158948 2, 0, 1; %e A158948 2, 1, 0, 1; %e A158948 3, 0, 1, 0, 1; %e A158948 3, 1, 0, 1, 0, 1; %e A158948 4, 0, 1, 0, 1, 0, 1; %e A158948 4, 1, 0, 1, 0, 1, 0, 1; %e A158948 5, 0, 1, 0, 1, 0, 1, 0, 1; %e A158948 5, 1, 0, 1, 0, 1, 0, 1, 0, 1; %e A158948 6, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1; %e A158948 6, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1; %e A158948 7, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1; %e A158948 ... %Y A158948 Cf. A000071. %K A158948 nonn,tabf %O A158948 1,4 %A A158948 _Gary W. Adamson_, Mar 31 2009