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 A143119 #2 Mar 31 2012 20:25:00 %S A143119 1,1,1,1,0,3,1,1,0,2,1,0,0,0,5,1,1,3,0,0,3,1,0,0,0,0,0,7,1,1,0,2,0,0, %T A143119 0,4,1,0,3,0,0,0,0,0,9,1,1,0,0,5,0,0,0,0,5,1,0,0,0,0,0,0,0,0,0,11,1,1, %U A143119 3,2,0,30,0,0,0,0,6,1,0,0,0,0,0,0,0,0,0,0,0,13,1,1,0,0,0,0,7,0,0,0,0,0,0,7 %N A143119 Triangle read by rows, A051731 * A026741 * 0^(n-k), 1<=k<=n. %C A143119 Row sums = A002131: (1, 2, 4, 4, 6, 8, 8, 8, 13,...). %F A143119 Triangle read by rows, A051731 * A026741 * 0^(n-k), 1<=k<=n, where A026741 starts (1, 1, 3, 2, 5, 3, 7, 4, 9,...). %e A143119 First few rows of the triangle are: %e A143119 1; %e A143119 1, 1; %e A143119 1, 0, 3; %e A143119 1, 1, 0, 2; %e A143119 1, 0, 0, 0, 5; %e A143119 1, 1, 3, 0, 0, 3; %e A143119 1, 0, 0, 0, 0, 0, 7; %e A143119 1, 1, 0, 2, 0, 0, 0, 4; %e A143119 ... %Y A143119 Cf. A026741, A002131. %K A143119 nonn,tabl %O A143119 1,6 %A A143119 Gary W. Adamson & _Mats Granvik_, Jul 26 2008