|
%I #8 May 10 2013 12:44:05
%S 1,3,20,105,504,4620,51480,45045,1361360,23279256,21162960,446185740,
%T 2059318800,5736673800,155272637520,4512611027925,8494326640800,
%U 8022419605200,281206918792800,267146572853160,10431437606647200
%N a(n) = (1/C(2n,0) - 1/C(2n,1) + ... + d/C(2n,2n))*L, where d = (-1)^2n, L = LCM{C(2n,0), C(2n,1),..., C(2n,2n)}.
%F a(n) = LCM{n+1, n+2, ..., 2*n+1}/(n+1). - _Vladeta Jovovic_, Oct 11 2002
%K nonn,easy
%O 0,2
%A _Clark Kimberling_
%E More terms from _James A. Sellers_, May 05 2000
|
