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Central terms of triangle A138271.
4

%I #2 Mar 30 2012 18:37:09

%S 1,2,18,268,5320,129474,3700550,121016160,4448701704,181463572394,

%T 8130511993010,396880976034092,20963000461338000,1191187898025406514,

%U 72455444438093714542,4697146562744837487104,323299667265950287087968

%N Central terms of triangle A138271.

%Y Cf. A138271; A138272, A138273, A138274.

%K nonn

%O 0,2

%A _Paul D. Hanna_, Mar 11 2008