OFFSET
4,3
COMMENTS
A triangulation is simple if it contains no separating 3-cycle.
LINKS
Andrew Howroyd, Table of n, a(n) for n = 4..200
EXAMPLE
The a(5) = 1 triangulation is:
o-------o
| \ / |
| o |
| / \ |
o-------o
PROG
(PARI) \\ R(n, m) defined in A210664.
seq(n)={my(v=R(n, 0)); for(m=1, n-1, v+=concat(vector(m), R(n-m, m))); v}
CROSSREFS
KEYWORD
nonn
AUTHOR
Andrew Howroyd, Feb 24 2021
STATUS
approved