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 A190454 #4 Mar 30 2012 18:57:28 %S A190454 1,4,9,14,17,22,25,27,30,35,38,43,48,51,56,59,64,69,72,77,80,82,85,90, %T A190454 93,98,103,106,111,114,119,124,127,132,137,140,145,148,153,158,161, %U A190454 166,169,171,174,179,182,187,192,195,200,203,208,213,216,221,226,229,234,237,242,247,250,255,258,260,263,268,271,276,281,284 %N A190454 Positions of 2 in A190451. %C A190454 See A190451. %t A190454 (See A190451.) %Y A190454 Cf. A190451. %K A190454 nonn %O A190454 1,2 %A A190454 _Clark Kimberling_, May 10 2011