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 A190778 #4 Mar 30 2012 18:57:29 %S A190778 1,4,5,8,11,15,18,21,22,25,28,32,35,39,42,45,49,52,56,59,62,63,66,69, %T A190778 73,76,79,80,83,86,90,93,97,100,103,104,107,110,114,117,120,121,124, %U A190778 127,131,134,138,141,144,145,148,151,155,158,161,162,165,168,172,175,179,182,185,189,192,196,199,202,203,206,209,213,216,219,220 %N A190778 Positions of 2 in A190775. %C A190778 See A190775. %t A190778 (See A190775.) %Y A190778 Cf. A190775. %K A190778 nonn %O A190778 1,2 %A A190778 _Clark Kimberling_, May 19 2011