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 A135043 #24 Jan 19 2019 16:25:01 %S A135043 0,1,8,9,10,17,18,19,26,27,28,35,36,37,44,45,46,53,54,55,62,63,64,71, %T A135043 72,73,80,81,82,89,90,91,98,99,100,107,108,109,116,117,118,125,126, %U A135043 127,134,135,136 %N A135043 Duplicate of A054966. %K A135043 dead %O A135043 1,3 %E A135043 The b-file has been removed. - _N. J. A. Sloane_, Jan 19 2019