A005498 Triangulations of the disk G_{2,n}. (Formerly M4146)

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, 903936171565752, 3560597348629860

Offset

0,2

References

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

Links

Andrew Howroyd, Table of n, a(n) for n = 0..500

Jean-François Alcover, Mathematica program

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

William 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

Mathematica

(* See links *)

Crossrefs

Row n=2 of 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

a(25) onwards from Andrew Howroyd, Nov 23 2024

Status

approved