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 A204577 #5 Mar 30 2012 17:23:05 %S A204577 0,0,10,1100,1000110,110011000,100101001010,11011000100100, %T A204577 10011101110001110,1110010111100110000,1010011101111110010010, %U A204577 111101000000111000111100,101100011100111010111010110 %N A204577 Sqrt(floor[A204575(n)/2]), written in binary. %H A204577 D. W. Wilson, <a href="/A204577/b204577.txt">Table of n, a(n) for n = 1..100</a> %Y A204577 See also A031149=sqrt(A023110) (base 10), A204502=sqrt(A204503) (base 9), A204514=sqrt(A055872) (base 8), A204516=sqrt(A055859) (base 7), A204518=sqrt(A055851) (base 6), A204520=sqrt(A055812) (base 5), A004275=sqrt(A055808) (base 4), A001075=sqrt(A055793) (base 3), A001541=sqrt(A055792) (base 2). %K A204577 nonn,base %O A204577 1,3 %A A204577 _M. F. Hasler_, Jan 16 2012