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A005503 Triangulations.
(Formerly M1248)
1
1, 2, 4, 11, 28, 91, 291, 1004, 3471, 12350, 44114, 159519, 579835, 2121845, 7800702 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Graphs can be enumerated and counted using the tool "plantri", in particular the command "./plantri -s -P[n] -c2m2 [n+1]". - Manfred Scheucher, Mar 08 2018

REFERENCES

C. F. Earl and L. J. March, Architectural applications of graph theory, pp. 327-355 of R. J. Wilson and L. W. Beineke, editors, Applications of Graph Theory. Academic Press, NY, 1979.

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

Table of n, a(n) for n=0..14.

G. Brinkmann and B. McKay, Plantri (program for generation of certain types of planar graph)

C. F. Earl and L. J. March, Architectural applications of graph theory, pp. 327-355 of R. J. Wilson and L. W. Beineke, editors, Applications of Graph Theory. Academic Press, NY, 1979. (Annotated scanned copy)

C. F. Earl & N. J. A. Sloane, Correspondence, 1980-1981

CROSSREFS

A row or column of the array in A169808.

Sequence in context: A148136 A148137 A148138 * A148139 A061860 A093960

Adjacent sequences:  A005500 A005501 A005502 * A005504 A005505 A005506

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane

EXTENSIONS

a(6) corrected and a(7)-a(14) from Manfred Scheucher, Mar 08 2018

STATUS

approved

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Last modified November 22 00:32 EST 2019. Contains 329383 sequences. (Running on oeis4.)