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 A214323 #11 Jul 24 2012 11:16:01 %S A214323 1,1,1,1,1,1,2,3,2,3,2,1,1,1,1,7,3,2,3,4,1,1,1,1,1,1,4,1,5,1,1,1,1,8, %T A214323 1,2,1,6,1,4,5,4,5,1,1,1,1,11,36,1,1,1,7,5,1,8,3,4,3,2,7,2,1,1,1,3,1, %U A214323 1,2,1,1,1,3,1,1,2,1,1,1,1,1 %N A214323 a(n) = gcd( A214551(n-1), A214551(n-3) ) with a(0) = a(1) = a(2) = 1. %C A214323 A214551(n) = A214322(n)/A214323(n). %C A214323 A214323(A214653(n)) = 1. - _Reinhard Zumkeller_, Jul 24 2012 %H A214323 N. J. A. Sloane, <a href="/A214323/b214323.txt">Table of n, a(n) for n = 0..10000</a> %o A214323 (Haskell) %o A214323 a214323 n = a214323_list !! n %o A214323 a214323_list = 1 : 1 : 1 : zipWith gcd a214551_list (drop 2 a214551_list) %o A214323 -- _Reinhard Zumkeller_, Jul 24 2012 %Y A214323 Cf. A214551, A214322; A214324, A214325 (record values and where they occur). %K A214323 nonn %O A214323 0,7 %A A214323 _N. J. A. Sloane_, Jul 23 2012