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A111878 a(n) = denominator(digamma(n+7/2)/2 + log(2) + euler_gamma/2)/15; a(n)=denominator(f(n+2)/15) = A111877(n+1)/5. 0

%I

%S 1,7,21,231,3003,3003,51051,969969,969969,22309287,111546435,

%T 334639305,9704539845,300840735195,300840735195,300840735195,

%U 11131107202215,11131107202215,456375395290815,19624141997505045,19624141997505045

%N a(n) = denominator(digamma(n+7/2)/2 + log(2) + euler_gamma/2)/15; a(n)=denominator(f(n+2)/15) = A111877(n+1)/5.

%C Sequence related to f(n)=1/1 + 1/3 + ... + 1/(2n+1).

%Y Cf. A025547.

%K easy,nonn

%O 0,2

%A _Paul Barry_, Aug 19 2005

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Last modified September 24 22:46 EDT 2021. Contains 347651 sequences. (Running on oeis4.)