A026335 - OEIS

%I #4 Mar 30 2012 18:56:06

%S 1,4,21,112,615,3432,19382,110432,633555,3654840,21179389,123195360,

%T 718887585,4206458700,24671967210,145008786304,853852037038,

%U 5035940194824,29744992814381,175921665090480,1041700117634505,6175002739467276

%N a(n) = T(2n,n-1), where T is the array in A026323.

%K nonn

%O 1,2

%A _Clark Kimberling_