

A005507


Triangulations of the disk K_{n,3}.
(Formerly M1622)


2



2, 6, 18, 52, 166, 524, 1722, 5664, 19072, 64408, 220676
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OFFSET

0,1


REFERENCES

C. F. Earl and L. J. March, Architectural applications of graph theory, pp. 327355 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..10.
C. F. Earl and L. J. March, Architectural applications of graph theory, pp. 327355 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, 19801981


FORMULA

a(n) = 2 * A005502(n)  A005495(n) (based on Max Alekseyev's formula, cf. A005500 and A005501).


CROSSREFS

A row or column of the array in A169809.
Sequence in context: A077835 A077984 A052979 * A252822 A094864 A120010
Adjacent sequences: A005504 A005505 A005506 * A005508 A005509 A005510


KEYWORD

nonn,more


AUTHOR

N. J. A. Sloane


EXTENSIONS

a(5)a(10) from Altug Alkan and Manfred Scheucher, Mar 08 2018


STATUS

approved



