OFFSET
1,5
COMMENTS
Irreducible means not made disconnected by removal of a vertex (no nugatory crossings).
Indecomposable (or prime) means not made disconnected by cutting two distinct lines.
LINKS
J. Betrema, Tait Curves
R. Coquereaux and J.-B. Zuber, Maps, immersions and permutations, arXiv preprint arXiv:1507.03163 [math.CO], 2015-2016. Also J. Knot Theory Ramifications 25, 1650047 (2016), DOI: 10.1142/S0218216516500474.
PROG
(C) See the J. Betrema C program in the Tait Curves link.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Robert Coquereaux, Nov 23 2015
EXTENSIONS
a(15)-a(16) using J. Betrema's program added by Andrey Zabolotskiy, Aug 24 2023
a(17)-a(23) from Brendan McKay, Mar 30 2024
STATUS
approved