A027986 - OEIS

%I #5 Mar 30 2012 18:56:16

%S 20,100,420,1694,6746,26735,105722,417613,1648692,6507197,25681362,

%T 101359219,400094756,1579568360,6237401648,24635828774,97327071806,

%U 384596629610,1520138671688,6009885957464,23765835521966,94003008751940

%N Sum{T(n,k)*T(n,k+2)}, 0<=k<=2n-2, T given by A027960.

%K nonn

%O 2,1

%A _Clark Kimberling_