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A005506 Triangulations of the disk K_{n,2}.
(Formerly M2676)
2
1, 3, 7, 19, 57, 176, 557, 1806, 5954, 19897, 67235, 229366 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

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..11.

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

FORMULA

a(n) = 2 * A005501(n) - A002711(n) (based on Max Alekseyev's formula, cf. A005501).

CROSSREFS

A row or column of the array in A169809.

Sequence in context: A188625 A258171 A263334 * A268125 A287484 A201169

Adjacent sequences:  A005503 A005504 A005505 * A005507 A005508 A005509

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane

EXTENSIONS

a(6)-a(11) from Altug Alkan and Manfred Scheucher, Mar 08 2018

STATUS

approved

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Last modified August 15 01:28 EDT 2020. Contains 336484 sequences. (Running on oeis4.)