OFFSET
-5,1
LINKS
Gheorghe Coserea, Table of n, a(n) for n = -5..50993
Omer Gimenez, Marc Noy, Asymptotic enumeration and limit laws of planar graphs, J. Amer. Math. Soc. 22 (2009), 309-329.
FORMULA
EXAMPLE
0.000004260938569161439...
PROG
(PARI)
A266389= 0.6263716633;
Xi(t) = (1+3*t) * (1-t)^3 / ((16*t^3));
B01(t) = (3*t-1)^2 * (1+t)^6 * log(1+t)/(512*t^6);
B02(t) = (3*t^4 - 16*t^3 + 6*t^2 - 1) * log(1 + 3*t) / (32*t^3);
B03(t) = (1+3*t)^2 * (1-t)^6 * log(1+2*t) / (1024*t^6);
B04(t) = (1/4)*log(3+t) - (1/2)*log(t) - (3/8)*log(16);
B05(t) = (217*t^6 + 920*t^5 + 972*t^4 + 1436*t^3 + 205*t^2 - 172*t + 6);
B06(t) = (1-t)^2 / (2048 * t^4 * (1+3*t) * (3+t));
B0(t) = B01(t) - B02(t) - B03(t) + B04(t) - B05(t) * B06(t);
B21(t) = (1-t)^3 * (3*t-1) * (1+3*t) * (1+t)^3 * log(1+t) / (256*t^6);
B22(t) = (1-t)^3 * (1+3*t) * log(1+3*t) / (32*t^3);
B23(t) = (1+3*t)^2 * (1-t)^6 * log(1+2*t) / (512*t^6);
B24(t) = (1-t)^4 * (185*t^4 + 698*t^3 - 217*t^2 - 160*t + 6);
B25(t) = 1024 * t^4 * (1+3*t) * (3+t);
B2(t) = B21(t) - B22(t) + B23(t) + B24(t) / B25(t);
P1(t) = -2400 + 57952*t + 303862*t^2 + 466546*t^3;
P2(t) = (264775 + 76679*t + 11495*t^2 + 739*t^3) * t^4;
P(t) = P1(t) + P2(t);
Q(t) = 400 + 1808*t + 2527*t^2 + 1155*t^3 + 237*t^4 + 17*t^5;
S(t) = 144 + 592*t + 664*t^2 + 135*t^3 + 6*t^4 - 5*t^5;
B41(t) = log((1+t)/sqrt(1+2*t)) * (1-t)^6 * (1+3*t)^2 / (512*t^6);
B42(t) = P(t) * (1-t)^5 / (2048 * t^4 * (3+t) * Q(t));
B4(t) = B41(t) + B42(t);
B5(t) = -sqrt(3)/90 * (1-t)^6 / (1+t)^(3/2) * (S(t) / (t*Q(t)))^(5/2);
C0(t) = Xi(t) + B0(t) + B2(t);
C5(t) = B5(t) * (1 - 2*B4(t) / Xi(t))^(-5/2);
K(t) = exp(C0(t)) * C5(t) / gamma(-5/2);
K(A266389)
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Gheorghe Coserea, Dec 28 2015
STATUS
approved