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%I #2 Mar 30 2012 18:59:15
%S 1,4,256,65536,1073741824,70368744177664,73786976294838206464,
%T 309485009821345068724781056,332306998946228968225951765070086144,
%U 1427247692705959881058285969449495136382746624
%N Numerators of Hankel transform of 1/(2n+1).
%C Conjecture - requires proof.
%F a(n)=4^A122247(n); a(n)=4^sum{k=1..n, sum{j=0..n, floor(k/2^j)}};
%K easy,nonn
%O 0,2
%A _Paul Barry_, Aug 27 2006
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