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A080690 Number of acyclic orientations of n X n grid graph. 1
1, 14, 2398, 5015972, 128091434266, 39931856138212664, 151966368274993474937668, 7059965159455454640307807067492, 4003910412343921295679925280332950062686, 27719972687144020161876951888422165049044889741764 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..10.

N. Calkin, C. Merino, S. Noble and M. Noy, Improved Bounds for the Number of Forests and Acyclic Orientations in the Square Lattice, The Electronic Journal of Combinatorics, Volume 10(1), 2003, #R4.

A. Pönitz, Über eine Methode zur Konstruktion... PhD Thesis (2004) C.3.

Peter Tittmann, More Results [Gives a(1)-a(14)]

CROSSREFS

Sequence in context: A279577 A015515 A183580 * A268424 A079918 A199648

Adjacent sequences:  A080687 A080688 A080689 * A080691 A080692 A080693

KEYWORD

nonn

AUTHOR

Andre Poenitz [Po"nitz], Peter Tittmann (poenitz(AT)htwm.de), Mar 03 2003

EXTENSIONS

a(10) from Alois P. Heinz, Dec 21 2013

STATUS

approved

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Last modified September 17 18:29 EDT 2021. Contains 347489 sequences. (Running on oeis4.)