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A069991 (-1)^(n+1)/14*sum(k=1,2n,C(2n+1,k)*B(k)*7^k) where C(n,k) are the binomial coefficients, B(k) the Bernoulli numbers. 0

%I

%S 1,24,1211,107426,14639841,2833334908,738420667591,249285306765270,

%T 105817142655593261,55162112425933979312,34643962156837119237651,

%U 25799726424152610741805834,22479598186937674926509533561

%N (-1)^(n+1)/14*sum(k=1,2n,C(2n+1,k)*B(k)*7^k) where C(n,k) are the binomial coefficients, B(k) the Bernoulli numbers.

%o (PARI) for(n=1,25,print1(-(-1)^n*sum(i=1,2*n,binomial(2*n+1,i)*bernfrac(i)*7^i)/14,","))

%K easy,nonn

%O 1,2

%A _Benoit Cloitre_, May 01 2002

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Last modified February 6 10:18 EST 2023. Contains 360104 sequences. (Running on oeis4.)