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 A190885 #4 Mar 30 2012 18:57:29 %S A190885 4,8,12,16,21,25,29,33,38,42,46,50,55,59,63,67,71,72,76,80,84,88,93, %T A190885 97,101,105,110,114,118,122,127,131,135,139,143,144,148,152,156,160, %U A190885 165,169,173,177,182,186,190,194,199,203,207,211,215,216,220,224,228,232,237,241,245,249,254,258,262,266,271,275,279,283,287,288 %N A190885 Positions of 3 in A189480. %C A190885 A sequence in a 4-way partition of the natural numbers. See A189480. %t A190885 (See A189480.) %Y A190885 Cf. A189480. %K A190885 nonn %O A190885 1,1 %A A190885 _Clark Kimberling_, May 23 2011