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 A020912 #10 Aug 02 2015 21:13:04 %S A020912 1,1,1,1,2,2,2,3,3,3,4,4,4,5,5,5,6,6,7,7,7,8,8,8,9,9,9,10,10,10,11,11, %T A020912 11,12,12,12,13,13,13,14,14,14,15,15,16,16,16,17,17,17,18,18,18,19,19, %U A020912 19,20,20,20,21,21,21,22,22,22,23,23,24,24,24,25,25,25,26,26,26,27,27 %N A020912 Number of terms in base 4 representation of n-th Fibonacci number. %F A020912 a(n) = A110591(A000045(n)). - _R. J. Mathar_, Feb 18 2008 %p A020912 A020912 := proc(n) nops(convert(combinat[fibonacci](n),base,4)) ; end: seq(A020912(n),n=1..120) ; # _R. J. Mathar_, Feb 18 2008 %t A020912 Length/@IntegerDigits[Fibonacci[Range[80]],4] (* _Harvey P. Dale_, Jul 27 2011 *) %K A020912 nonn,base,easy %O A020912 1,5 %A A020912 _Clark Kimberling_ %E A020912 More terms from _R. J. Mathar_, Feb 18 2008