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 A204576 #9 Mar 30 2012 17:23:05 %S A204576 0,0,100,10010000,1001100100100,101000101001000000, %T A204576 10101100100100101100100,1011011100110011010100010000, %U A204576 110000100111101101100001011000100,11001110011101010100101010100100000000,1101101100101100000000000111010111101000100 %N A204576 Floor[A055792(n-1)/2]=A084703(n-2) (truncated squares), written in binary. %C A204576 A204575 with the last (binary) digit (necessarily = 1, except for a(1)=0) deleted. %C A204576 Also: Squares, written in binary, such that appending a (binary) digit (necessarily = 1) yields another square (except for a(1)=0 which corresponds to A204575(1)=00, the only square which remains square when multiplied by 2). %H A204576 David W. Wilson, <a href="/A204576/b204576.txt">Table of n, a(n) for n = 1..100</a> %Y A204576 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 A204576 nonn,base %O A204576 1,3 %A A204576 _M. F. Hasler_, Jan 16 2012