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 A215592 #14 Mar 10 2013 14:15:43 %S A215592 0,0,0,0,1,0,1,0,1,0,1,2,0,1,2,0,1,2,0,1,2,3,0,1,2,3,0,1,2,3,0,1,2,3, %T A215592 0,4,1,2,3,0,4,1,2,3,0,4,1,2,3,0,4,1,5,2,3,0,4,1,5,2,3,0,4,1,5,2,3,0, %U A215592 4,1,5,2,6,3,0,4,1,5,2,6,3 %N A215592 Value of y in the n-th number of the form x+y*(3+sqrt(13))/2. %C A215592 Differs from A025684 first at the index 308. (The 0 and 13 at indices 308 and 309 are swapped). - _R. J. Mathar_, Mar 10 2013 %H A215592 Peter G. Anderson, <a href="/A215592/b215592.txt">Table of n, a(n) for n = 1..584</a> %Y A215592 A215591 is the value of x. %K A215592 nonn %O A215592 1,12 %A A215592 _Peter G. Anderson_, Aug 16 2012