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

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.

Jean-François Alcover, Mathematica program

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

Mathematica

(* See links *)

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