A005498 Triangulations of the disk G_{2,n}.

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

Author

N. J. A. Sloane

Keywords

• nonn

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]

Crossrefs

Row n=2 of A262586.

Programs

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 *)

Extensions

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

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