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%I #5 Mar 30 2012 18:39:04
%S 1,3,30,14,3960,24024,28288,1860480,94140288,199971200,1183311360,
%T 12386350080,284826214400,2376389615616,433030996623360,
%U 15188999733248,73886889202384896,484018391833804800,4234776786964971520
%N Denominator of b(n) = (50*n-6)/C(3n,n)/2^n.
%C A powerful series to compute Pi via the Beta method. Proved first by Almkvist, Krattenthaler, Petersson (2001).
%F sum ( k>=0, b(k)) = Pi
%o (PARI) a(n)=denominator((50*n-6)/binomial(3*n,n)/2^n)
%Y Cf. A072972.
%K easy,frac,nonn
%O 0,2
%A _Benoit Cloitre_, Aug 13 2002
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