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 A189787 #21 Apr 27 2018 18:43:28 %S A189787 3,7,11,15,19,23,27,31,35,39,43,47,51,55,59,63,67,71,75,79,83,87,91, %T A189787 95,99,103,107,111,115,119,123,127,131,135,139,143,147,151,155,159, %U A189787 163,167,171,175,179,183,187,190,194,198,202,206,210,214,218,222,226,230,234,238,242,246,250,254,258,262,266,270,274,278,282 %N A189787 a(n) = A189785(n)/2. %C A189787 See A189785. %t A189787 (See A189785.) %Y A189787 Cf. A189785, A189786. %K A189787 nonn %O A189787 1,1 %A A189787 _Clark Kimberling_, Apr 27 2011 %E A189787 Name corrected by _Nathaniel Johnston_ and _R. J. Mathar_, May 16 2011 %E A189787 Comment and formula corrected by _Jaroslav Krizek_, Jul 29 2016