This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A076151 #16 Feb 20 2024 02:20:49 %S A076151 1,8,110,2184,57120,1860480,72681840,3315312000,173059286400, %T A076151 10178348544000,666172912204800,48032775105638400,3783468344527872000, %U A076151 323279062935013785600,29783920485745730304000,2943352142120754524160000,310589942708652231905280000 %N A076151 a(n) = (n-1)!*binomial(3*n,n)/(3*(2*n+1)). %H A076151 M. Bousquet and C. Lamathe, <a href="https://doi.org/10.1016/j.disc.2004.11.015">Enumeration of solid trees according to edge number and edge degree distribution</a>, Discr. Math., 298 (2005), 115-141. %F A076151 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 A076151 nonn %O A076151 2,2 %A A076151 _N. J. A. Sloane_, May 18 2003