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A076151 (n-1)!*binomial(3*n,n)/(3*(2*n+1)). 0

%I

%S 1,8,110,2184,57120,1860480,72681840,3315312000,173059286400,

%T 10178348544000,666172912204800,48032775105638400,3783468344527872000,

%U 323279062935013785600,29783920485745730304000,2943352142120754524160000,310589942708652231905280000

%N (n-1)!*binomial(3*n,n)/(3*(2*n+1)).

%H M. Bousquet and C. Lamathe, <a href="http://www.lacim.uqam.ca/~lamathe/darbresDM.pdf">Enumeration of solid trees according to edge number and edge degree distribution</a>, Discr. Math., 298 (2005), 115-141.

%F 2*n*(2*n+1)*a(n) -3*(n-1)*(3*n-1)*(3*n-2)*a(n-1)=0. - _R. J. Mathar_, Jun 07 2013

%K nonn

%O 2,2

%A _N. J. A. Sloane_, May 18 2003

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Last modified July 24 23:25 EDT 2021. Contains 346273 sequences. (Running on oeis4.)