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A268606 Number of ways to trisect a hexagon with side length n exactly into three identical parts in a triangular lattice. 5
1, 5, 116, 15785, 11599297, 47212453928, 1100377983366327, 148568527921382084692 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..8.

G. P. Jelliss, Dissected Hexagons, The Games and Puzzles Journal, Issue 22, January-April 2002.

Luca Petrone, Illustration showing a(3) = 116

CROSSREFS

Cf. A257952, A271741, A271857.

Sequence in context: A230338 A156514 A319392 * A006221 A265977 A208387

Adjacent sequences:  A268603 A268604 A268605 * A268607 A268608 A268609

KEYWORD

nonn,hard,more

AUTHOR

Luca Petrone, Feb 08 2016

EXTENSIONS

Added a(6) from Jelliss's website by Vaclav Kotesovec, Mar 03 2016

a(7)-a(8) from Andrew Howroyd, Apr 11 2016

STATUS

approved

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Last modified December 10 15:09 EST 2019. Contains 329896 sequences. (Running on oeis4.)