A058921 a(n) = round((6*n)!/( 2^(3*n)*(3*n)!*6^(2*n) )).

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

Harry J. Smith, Table of n, a(n) for n = 0..162

Prog

(PARI) a(n) = { round((6*n)!/(2^(3*n)*(3*n)!*6^(2*n))) } \\ Harry J. Smith, Jun 24 2009

Crossrefs

Sequence in context: A110039 A271741 A254857 * A240283 A181153 A184974

Adjacent sequences: A058918 A058919 A058920 * A058922 A058923 A058924

Keyword

nonn

Author

N. J. A. Sloane, Jan 11 2001

Status

approved