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%I #5 Mar 30 2012 18:39:10
%S 1,43,2099,388663,139467719,81165563683,69426732871739,
%T 81922705364469103,127490352997174502159,252973121503691631872923,
%U 623357309124524241322006979,1867492959566204749744784303143
%N a(0)=1 if n>0 a(n)=(-1)^(n+1)/(2n+1)*sum(k=0,n,4^(4k)*B(2k)*C(2n+1,2k)) where B(k) denotes the k-th Bernoulli number.
%K nonn
%O 0,2
%A _Benoit Cloitre_, Oct 19 2002
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