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 A160183 #11 May 31 2013 14:29:09 %S A160183 1,2,1,3,1,1,5,2,1,1,6,2,1,1,1,10,4,2,1,1,1,11,4,2,1,1,1,1,16,6,3,2,1, %T A160183 1,1,1,19,7,4,2,1,1,1,1,1,26,10,5,3,2,1,1,1,1,1 %N A160183 Triangle, read by rows, obtained by dropping right diagonal from A160182. %C A160183 A054525 * A160183 = triangle A160182. Mobius transform A054525 of the triangle shifts to the left adding I, I = Identity matrix. %C A160183 Left border = A003238 starting (1, 2, 3, 5, 6, 10, 11, 16, 19,...). %F A160183 A054525 * triangle A160182, also obtained by shifting triangle A160182 to the right, deleting the (1,1,1,...) right border. %e A160183 First few rows of the triangle = %e A160183 1; %e A160183 2, 1; %e A160183 3, 1, 1; %e A160183 5, 2, 1, 1; %e A160183 6, 2, 1, 1, 1; %e A160183 10, 4, 2, 1, 1, 1; %e A160183 11, 4, 2, 1, 1, 1, 1; %e A160183 16, 6, 3, 2, 1, 1, 1, 1; %e A160183 19, 7, 4, 2, 1, 1, 1, 1, 1; %e A160183 26, 10, 5, 3, 2, 1, 1, 1, 1, 1; %e A160183 ... %Y A160183 Cf. A160182, A068336. %K A160183 nonn,tabl %O A160183 1,2 %A A160183 _Gary W. Adamson_, May 03 2009