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A006674 Triangulations of a square with no separating triangles (previously "Bordered triangulations of sphere with n nodes").
(Formerly M1631)
0
1, 1, 2, 6, 18, 68, 282, 1309, 6437, 33264, 177260, 968349 (list; graph; refs; listen; history; text; internal format)
OFFSET
5,3
REFERENCES
H. Heesch, Ein zum Vierfarbensatz aquivalenter Satz der Panisochromie [ A theorem of panisochromaticity equivalent to the four color theorem ], pp. 229-253 of Graph Theory in Memory of G. A. Dirac (Sandbjerg, 1985). Edited by L. D. Andersen et al., Annals of Discrete Mathematics, 41. North-Holland Publishing Co., Amsterdam-New York, 1989.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
LINKS
CROSSREFS
Sequence in context: A150079 A150080 A150081 * A006389 A030269 A150082
KEYWORD
nonn
AUTHOR
EXTENSIONS
Terms a(13)-a(16) computed with plantri from Gordon Royle, Jun 10 2021
STATUS
approved

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Last modified April 20 03:59 EDT 2024. Contains 371798 sequences. (Running on oeis4.)