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A005498 Triangulations of the disk G_{2,n}.
(Formerly M4146)
3
1, 6, 21, 88, 330, 1302, 5005, 19504, 75582, 294140, 1144066, 4458192, 17383860, 67866918, 265182525, 1037169760, 4059928950, 15905412468, 62359143990, 244662838160, 960566918220, 3773656396796, 14833897694226, 58343359313568, 229591913401900 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

REFERENCES

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..24.

William G. Brown, Enumeration of Triangulations of the Disk, Proc. Lond. Math. Soc. s3-14 (1964) 746-768.

W. G. Brown, Enumeration of Triangulations of the Disk, Proc. Lond. Math. Soc. s3-14 (1964) 746-768. [Annotated scanned copy]

MAPLE

A005498 := proc(n)

        BrownG(2, n) ;

end proc:  # take BrownG from A210696

seq(A005498(n), n=0..25) ; # R. J. Mathar, Mar 30 2012

CROSSREFS

A row or column of the array in A262586.

Sequence in context: A316105 A137966 A304187 * A002222 A290355 A006359

Adjacent sequences:  A005495 A005496 A005497 * A005499 A005500 A005501

KEYWORD

nonn

AUTHOR

N. J. A. Sloane

EXTENSIONS

More terms from R. J. Mathar, Mar 30 2012

STATUS

approved

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Last modified February 19 18:30 EST 2019. Contains 320327 sequences. (Running on oeis4.)