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 A215590 #8 Aug 16 2012 23:23:32 %S A215590 0,0,0,1,0,1,0,1,2,0,1,2,0,1,2,0,3,1,2,0,3,1,2,0,3,1,4,2,0,3,1,4,2,0, %T A215590 3,1,4,2,0,5,3,1,4,2,0,5,3,1,4,2,0,5,3,1,6,4,2,0,5,3,1,6,4,2,0,5,3,1, %U A215590 6,4,2,7 %N A215590 Value of y in the n-th number of the form x+y*(1+sqrt(2)). %C A215590 A215589 gives the value of x. %H A215590 Peter G. Anderson, <a href="/A215590/b215590.txt">Table of n, a(n) for n = 1..1064</a> %Y A215590 Cf. A215589. %K A215590 nonn %O A215590 1,9 %A A215590 _Peter G. Anderson_, Aug 16 2012