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 A268433 #7 Feb 25 2016 03:24:16 %S A268433 1,1,5,7,59,95,377,655,10163,18459,71099,132641,1021455,1937515, %T A268433 7477505,14335423,443971523,857241875,3328921191,6459762413, %U A268433 50311588373,97986366561,382518036575,747066030569,11690129046071,22881444619663,89673873841559,175837008468485 %N A268433 a(n) = A106184(n) / A001316(n). %F A268433 a(n) = 2^(2*n-A000120(n))*hypergeometric([-n,1/2],[1],1)*hypergeometric([1/2,-n/2,-n/2+1/2],[-n/2+3/4,-n/2+1/4],1/2). %p A268433 H := n -> hypergeom([1/2,-n/2,-n/2+1/2],[-n/2+3/4,-n/2+1/4],1/2): %p A268433 A000984 := n -> 4^n*hypergeom([-n,1/2],[1],1): %p A268433 A001316 := n -> 2^(add(i, i = convert(n, base, 2))): %p A268433 a := n -> H(n)*A000984(n)/A001316(n): seq(simplify(a(n)),n=0..27); %Y A268433 Cf. A000120, A000984, A001316, A106184. %K A268433 nonn %O A268433 0,3 %A A268433 _Peter Luschny_, Feb 24 2016