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A058921
a(n) = round((6*n)!/( 2^(3*n)*(3*n)!*6^(2*n) )).
1
1, 0, 8, 739, 188278, 102375969, 101821432401, 167335039031665, 422730142353744596, 1555259421231289181129, 7990793301334594538543360, 55446117019635417854317742418, 505534592436277558571563209641430, 5920020716842325326522410002905164381
OFFSET
0,3
REFERENCES
G.-B. Chae, E. M. Palmer and R. W. Robinson, Asymptotic number of general cubic graphs, preprint, Oct 30, 2000.
LINKS
PROG
(PARI) { default(realprecision, 100); L = 10^(10^3 - 6); for (n = 0, 200, a=round((6*n)!/(2^(3*n)*(3*n)!*6^(2*n))); if (a > L, break); write("b058921.txt", n, " ", a); ) } \\ Harry J. Smith, Jun 24 2009
CROSSREFS
Sequence in context: A110039 A271741 A254857 * A240283 A181153 A184974
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jan 11 2001
STATUS
approved