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 A133380 #3 Mar 30 2012 17:25:25 %S A133380 1,1,1,3,1,1,4,5,1,1,7,6,7,1,1,10,13,8,9,1,1,16,17,21,10,11,1,24,30, %T A133380 26,31,12,13,1,1,38,42,52,37,43,14,15,1,1,59,69,69,84,50,57,16,17,1,1 %N A133380 A055450 + A030111 - A000012 as infinite lower triangular matrices. %C A133380 Row sums = A134508 %e A133380 First few rows of the triangle are: %e A133380 1; %e A133380 1, 1; %e A133380 3, 1, 1; %e A133380 4, 5, 1, 1; %e A133380 7, 6, 7, 1, 1; %e A133380 10, 13, 8, 9, 1, 1; %e A133380 16, 17, 21, 10, 11, 1, 1; %e A133380 24, 30, 26, 31, 12, 13, 1, 1; %e A133380 38, 42, 52, 37, 43, 14, 15, 1, 1; %e A133380 ... %Y A133380 Cf. A055450, A030111, A134508. %K A133380 nonn,tabl %O A133380 1,4 %A A133380 _Gary W. Adamson_, Oct 28 2007