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A138462 A bisection of A006318. 1

%I

%S 1,6,90,1806,41586,1037718,27297738,745387038,20927156706,

%T 600318853926,17518619320890,518431875418926

%N A bisection of A006318.

%F a(n)=Sum_{i=0..2n} (C(2*n+1,i+1)*C(2*n+i,i))/(2*n+1). - _Vladimir Kruchinin_, Apr 02 2017

%o (Maxima)

%o a(n):=sum(binomial(2*n+1,i+1)*binomial(2*n+i,i),i,0,2*n)/(2*n+1); /* _Vladimir Kruchinin_, Apr 02 2017 */

%K nonn,more

%O 0,2

%A _N. J. A. Sloane_, May 08 2008

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Last modified July 23 04:04 EDT 2017. Contains 289686 sequences.