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 A141289 #3 Mar 30 2012 17:25:28 %S A141289 1,1,2,1,1,2,3,1,2,1,1,2,3,4,1,1,2,3,1,2,1,1,2,3,4,5,1,2,1,1,2,3,4,1, %T A141289 1,2,3,1,2,1,1,2,3,4,5,6,1,1,2,3,1,2,1,1,2,3,4,5,1,2,1,1,2,3,4,1,1,2, %U A141289 3,1,2,1,1,2,3,4,5,6,7 %N A141289 Triangle read by rows, n-th row = (n-2)-th row appended to the beginning of (n-1)-th row, + n. %C A141289 There are (1, 2, 4, 7, 12,...) terms per row where (0, 0, 1, 2, 4, 7, 12,...) = A000071 = Fibonacci numbers - 1. %C A141289 Row sums = A001924: (1, 3, 7, 14, 26, 46,...) %F A141289 Triangle read by rows, n-th row = (n-2)-th row appended to the beginning of (n-1)-th row, + n. %e A141289 First few rows of the triangle are: %e A141289 1; %e A141289 1, 2; %e A141289 1, 1, 2, 3; %e A141289 1, 2, 1, 1, 2, 3, 4; %e A141289 1, 1, 2, 3, 1, 2, 1, 1, 2, 3, 4, 5; %e A141289 1, 2, 1, 1, 2, 3, 4, 1, 1, 2, 3, 1, 2, 1, 1, 2, 3, 4, 5, 6; %e A141289 ... %e A141289 Row 4 = (1, 2, 1, 1, 2, 3, 4) = (row 2 appended to row 3, + 4); = (1, 2) appended to (1, 1, 2, 3), then 4. %Y A141289 Cf. A000071, A001924. %K A141289 nonn,tabf %O A141289 1,3 %A A141289 _Gary W. Adamson_, Jun 22 2008