OFFSET
0,2
COMMENTS
A quasi series-parallel matroid is a collection of series-parallel matroids. See the Ferroni/Larson reference for a precise definition.
LINKS
Andrew Howroyd, Table of n, a(n) for n = 0..200
Luis Ferroni and Matt Larson, Kazhdan-Lusztig polynomials of braid matroids, arXiv:2303.02253 [math.CO], 2023.
PROG
(PARI) seq(n)=Vec(serlaplace( exp(2*x + intformal(serreverse(2*log(1 + x + O(x^n)) - x))) ))
(PARI) seq(n) = Vec(serlaplace( exp(2*x + intformal(-x + 2*serreverse(1 + 2*x - exp(x + O(x^n))))) ))
CROSSREFS
KEYWORD
nonn
AUTHOR
Andrew Howroyd, Mar 08 2023
STATUS
approved