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 A141741 #3 Aug 24 2012 10:50:01 %S A141741 35,41,45,70,71,78,82,83,90,91,94,110 %N A141741 Starting from the 1 in the first line of triangle A141727 choose one of the three digits below it. Repeat down to the other rows. Sequence gives the numbers in base 10 expressed by the collected digits that cannot be reached following any possible path. %e A141741 35 in binary is 100011. We do not have any path starting from the 1 in the first row that leads to this sequence of digits. %Y A141741 Cf. A141727 - A141740, A141742 - A141746. %K A141741 easy,nonn %O A141741 0,1 %A A141741 _Paolo P. Lava_ and _Giorgio Balzarotti_, Jul 07 2008