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 A191178 #21 Jun 24 2017 19:54:01 %S A191178 1,2,3,6,9,10,18,22,27,30,34,38,50,54,66,70,81,86,90,102,106,114,118, %T A191178 134,150,162,178,198,210,214,243,258,262,270,278,306,318,322,342,354, %U A191178 358,370,402,406,422,450,454,470,486,534,562,594,598,626,630,642,646,729,774,786,790,810,834,838,854 %N A191178 Integers in (A191127)/3. %C A191178 Contains A191127 as a proper subsequence. %t A191178 (See A191127.) %Y A191178 Cf. A191113, A191127. %K A191178 nonn %O A191178 1,2 %A A191178 _Clark Kimberling_, May 27 2011