OFFSET
0,4
COMMENTS
A 2,3 cactus is a cactus composed of bridges and triangles.
LINKS
Andrew Howroyd, Table of n, a(n) for n = 0..500
Wikipedia, Cactus graph.
PROG
(PARI) seq(n) = Vec(1 + x/(1 - serreverse((sqrt(1 + 4*x + O(x^n)) - 1)*(1 - x)^2/2)))
CROSSREFS
KEYWORD
nonn
AUTHOR
Andrew Howroyd, Mar 08 2023
STATUS
approved