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 A050612 #4 May 01 2014 02:49:07
%S A050612 2,7,15,54,91,329,714,2583,4183,15134,32853,118863,200690,726103,
%T A050612 1576239,5702886,9227467,33385289,72473466,262211463,442721993,
%U A050612 1601783218,3477183675,12580568721,20374242722,73714702663
%N A050612 Sum_{i=0..n} (C(n,i) mod 2)*Fibonacci(2i+3) = FL(n+3)Product(L(2^i)^bit(n,i),i=0..).
%Y A050612 Fourth row of A050609, fourth column of A050610.
%K A050612 nonn
%O A050612 0,1
%A A050612 _Antti Karttunen_, Oct 24 1999