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 A106468 #5 May 26 2017 16:42:16 %S A106468 1,1,1,1,0,1,1,1,1,1,0,0,1,0,1,0,0,1,1,1,1,0,0,0,0,1,0,1,0,0,0,0,1,1, %T A106468 1,1,0,0,0,0,0,0,1,0,1,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,1,0,1,0,0, %U A106468 0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,1,0,1,0,0,0,0,0,0,0,0,0,0,1,1,1,1 %N A106468 Absolute value of inverse of number triangle A106465. %C A106468 A 'mixed' sequence array : rows alternate between the rows of the sequence array for the sequence (1,0,1,0,0,0...) and the sequence array for the sequence (1,1,1,1,0,0,0,...). Column 2k has g.f. x^2k(1+x+x^2+x^3); column 2k+1 has g.f. x^(2k+1)(1+x^2). Row sums are A106469. A106468=mod(A106465^(-1),2). %e A106468 Triangle begins %e A106468 1; %e A106468 1,1; %e A106468 1,0,1; %e A106468 1,1,1,1; %e A106468 0,0,1,0,1; %e A106468 0,0,1,1,1,1; %e A106468 0,0,0,0,1,0,1; %K A106468 nonn,tabl %O A106468 0,1 %A A106468 _Paul Barry_, May 03 2005