OFFSET
0,3
COMMENTS
These numbers provide the 5th order of the 1/N-expansion of traces of powers of a random time-delay matrix in presence of time-reversal symmetry. (The 0th order is given by the Large Schröder numbers A006318.)
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..1000
F. D. Cunden, F. Mezzadri, N. Simm and P. Vivo, Large-N expansion for the time-delay matrix of ballistic chaotic cavities, J. Math. Phys. 57, 111901 (2016).
FORMULA
G.f.: -(2*z*(96*z^7 - 456*z^6 + 2992*z^5 - 7068*z^4 + 3089*z^3 + 8214*z^2 + 979*z + 12)) / (y(z)^(13/2)) - (2*z*(288*z^8 + 776*z^7 - 336*z^6 - 2916*z^5 + 6276*z^4 - 1312*z^3 - 7560*z^2 - 964*z - 12)) / (y(z)^7), where y(z) = z^2-6*z+1.
MATHEMATICA
y[z] := z^2 - 6*z + 1; CoefficientList[Series[-(2*z*(96*z^7 - 456*z^6 + 2992*z^5 - 7068*z^4 + 3089*z^3 + 8214*z^2 + 979*z + 12))/(y[z]^(13/2)) - (2*z*(288*z^8 + 776*z^7 - 336*z^6 - 2916*z^5 + 6276*z^4 - 1312*z^3 - 7560*z^2 - 964*z - 12))/(y[z]^7), {z, 0, 50}], z] (* G. C. Greubel, Jan 29 2017 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Fabio Deelan Cunden, Oct 26 2016
EXTENSIONS
More terms from Michel Marcus, Oct 30 2016
STATUS
approved