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A341917 Number of strong triangulations of a fixed pentagon with n interior nodes. 3
1, 10, 80, 610, 4625, 35322, 272800, 2132310, 16861455, 134781350, 1088074064, 8863227100, 72789560025, 602232150810, 5016320750400, 42041168169712, 354326295908580, 3001705818071400, 25549873091193600, 218426240780417250, 1874878554813727815, 16153461053030605590 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Andrew Howroyd, Table of n, a(n) for n = 1..500

FORMULA

a(n) = 60*(13*n+9)*(4*n+5)!/((3*n+9)!*(n-1)!).

PROG

(PARI) a(n)={60*(13*n+9)*(4*n+5)!/((3*n+9)!*(n-1)!)}

CROSSREFS

Column k=2 of A341856.

Cf. A341853.

Sequence in context: A257286 A125373 A093145 * A037509 A037692 A126531

Adjacent sequences:  A341914 A341915 A341916 * A341918 A341919 A341920

KEYWORD

nonn

AUTHOR

Andrew Howroyd, Feb 23 2021

STATUS

approved

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Last modified June 30 06:00 EDT 2022. Contains 354914 sequences. (Running on oeis4.)