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 A255919 #8 Mar 11 2015 09:39:38
%S A255919 0,1,1,3,2,7,12,11,31,51,44,117,216,157,453,851,566,1315,3860,6271,
%T A255919 5979,16291,26552,22537,61360,112537,79657,229603,439754,275695,
%U A255919 715580,2019251,3253127,3089427,8160916,13281965,9582952,29937989,58607677,36145651,85311918
%N A255919 Gray code of Fibonacci(n).
%F A255919 a(n) = A003188(A000045(n)).
%p A255919 A255919 := proc(n)
%p A255919 A003188(combinat[fibonacci](n)) ;
%p A255919 end proc:
%p A255919 seq(A255919(n),n=0..40) ;
%t A255919 GrayCode[n_] := BitXor[n, Floor[n/2]]; Table[ GrayCode[ Fibonacci[ n]], {n, 0, 40}] (* _Robert G. Wilson v_, Mar 09 2015 *)
%o A255919 (PARI) A255919(n)=my(f=fibonacci(n)); bitxor(f, f\2); \\ _Joerg Arndt_, Mar 10 2015
%Y A255919 Cf. A000045, A003188.
%K A255919 nonn
%O A255919 0,4
%A A255919 _R. J. Mathar_, Mar 11 2015