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 A082498 #5 Jul 20 2013 16:26:40 %S A082498 0,1,1,1,1,2,1,2,1,2,2,3,1,3,2,3,1,3,2,3,2,4,3,5,1,4,3,4,2,5,3,5,1,4, %T A082498 3,4,2,5,3,5,2,5,4,6,3,7,5,8,1,6,4,5,3,7,4,7,2,6,5,7,3,8,5,8,1,6,4,5, %U A082498 3,7,4,7,2,6,5,7,3,8,5,8,2,7,5,7,4,9,6,10,3,9,7,10,5,12,8 %N A082498 a(0)=0, a(1)=1, a(2n)=a(n), a(2n+1)=a(n)+a(n-1). %H A082498 Reinhard Zumkeller, <a href="/A082498/b082498.txt">Table of n, a(n) for n = 0..10000</a> %o A082498 (PARI) a(n) = if(n<2,n,if(n%2==0,a(n/2),a((n-1)/2)+a((n-3)/2))) %o A082498 (Haskell) %o A082498 a082498 n = a082498_list !! n %o A082498 a082498_list = 0 : 1 : concat %o A082498 (zipWith (\u v -> [u, u + v]) (tail a082498_list) a082498_list) %o A082498 -- _Reinhard Zumkeller_, Jul 19 2013 %Y A082498 Cf. A020951. %K A082498 nonn %O A082498 0,6 %A A082498 _Ralf Stephan_, Apr 29 2003