A027317 - OEIS

%I #9 Oct 27 2019 19:55:59

%S 1,6,71,561,4797,41462,359530,3124752,27213084,237432807,2075064759,

%T 18162872365,159198909233,1397157808149,12275908402205,

%U 107974903916703,950639462501475,8377212510209165,73882962176311701,652114141845864819,5759883148706408695

%N a(n) = Sum_{k=0..m-2} T(n,k) * T(n,k+2), where m=n for n=0,1,2,3; m=2n for n >= 4; and T is given by A026082.

%K nonn

%O 2,2

%A _Clark Kimberling_

%E More terms from _Sean A. Irvine_, Oct 27 2019