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%I #12 Dec 21 2024 23:51:18
%S 1,0,8,739,188278,102375969,101821432401,167335039031665,
%T 422730142353744596,1555259421231289181129,7990793301334594538543360,
%U 55446117019635417854317742418,505534592436277558571563209641430,5920020716842325326522410002905164381
%N a(n) = round((6*n)!/( 2^(3*n)*(3*n)!*6^(2*n) )).
%D G.-B. Chae, E. M. Palmer and R. W. Robinson, Asymptotic number of general cubic graphs, preprint, Oct 30, 2000.
%H Harry J. Smith, <a href="/A058921/b058921.txt">Table of n, a(n) for n = 0..162</a>
%o (PARI) a(n) = { round((6*n)!/(2^(3*n)*(3*n)!*6^(2*n))) } \\ _Harry J. Smith_, Jun 24 2009
%K nonn
%O 0,3
%A _N. J. A. Sloane_, Jan 11 2001