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 A140582 #4 Mar 03 2013 14:29:00 %S A140582 1,2,1,4,1,1,4,2,1,1,8,2,1,1,1,5,4,2,1,1,1,11,4,2,1,1,1,1,11,4,2,2,1, %T A140582 1,1,1,11,4,4,2,1,1,1,1,1,6,8,4,2,2,1,1,1,1,1,16,8,4,2,1,1,1,1,1,1,16, %U A140582 5,4,4,2,2,1,1,1,1,1,1,28,5,4,4,2,2,1,1,1,1,1,1,1 %N A140582 Triangle read by rows, A000012 * A140581. %C A140582 Row sums = A072107: (1, 3, 6, 8, 13, 14,...). %F A140582 Triangle read by rows, A000012 * A140581; where A000012 = the infinite lower triangular matrix with all 1's: [1; 1,1; 1,1,1;...]. %e A140582 First few rows of the triangle are: %e A140582 1; %e A140582 2, 1; %e A140582 4, 1, 1; %e A140582 4, 2, 1, 1; %e A140582 8, 2, 1, 1, 1; %e A140582 5, 4, 2, 1, 1, 1; %e A140582 11, 4, 2, 1, 1, 1, 1; %e A140582 11, 4, 2, 2, 1, 1, 1, 1; %e A140582 11, 4, 4, 2, 1, 1, 1, 1, 1; %e A140582 6, 8, 4, 2, 2, 1, 1, 1, 1, 1; %e A140582 ... %Y A140582 Cf. A140581, A072107. %K A140582 nonn,tabl %O A140582 0,2 %A A140582 _Gary W. Adamson_ and _Mats Granvik_, May 17 2008