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 A151727 #2 Mar 30 2012 16:51:06 %S A151727 4,20,20,44,28,60,76,92,28,60,84,116,116,196,236,188,28,60,84,116,116, %T A151727 196,244,212,116,204,284,348,428,628,652,380,28,60,84,116,116,196,244, %U A151727 212,116,204,284,348,428,628,660,404,116,204,284,348,428 %N A151727 If A151726 is written as a triangle, this is what the rows converge to. %Y A151727 Cf. A151725, A151726, A151729. Equals 4*A151728. %K A151727 nonn %O A151727 0,1 %A A151727 _N. J. A. Sloane_, Jun 14 2009