OFFSET
0,1
COMMENTS
This is the leading constant in the asymptotic formula for the number of labeled 2-connected (simple) graphs.
LINKS
Graeme Kemkes, Cristiane M. Sato, and Nicholas Wormald, Asymptotic enumeration of sparse 2-connected graphs, arXiv:1010.2516 [math.CO], 2010-2011. See Section 2, especially Corollary 3.
E. M. Wright, The number of connected sparsely edged graphs. IV. Large nonseparable graphs, J. Graph Theory 7 (1983), 219-229. See Theorem 4.
EXAMPLE
0.2542003...
MAPLE
evalf(sqrt(3/2/Pi)/exp(1))
MATHEMATICA
RealDigits[Sqrt[3/(2Pi)]/E, 10, 120][[1]] (* Harvey P. Dale, Jul 28 2019 *)
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Graeme Kemkes, Dec 09 2010
STATUS
approved