%I #8 Oct 23 2019 20:08:34
%S 1,5,16,68,276,1084,4227,16207,61348,229888,853737,3146649,11522891,
%T 41959547,152044236,548575204,1971713228,7062750256,25222033633,
%U 89824310345,319101174069,1131049761757,4000730847474,14124602551114
%N a(n) = Sum_{k=0..n-1} T(n,k) * T(n,2n-k), with T given by A027082.
%K nonn
%O 1,2
%A _Clark Kimberling_