A080690 Number of acyclic orientations of n X n grid graph.

1, 14, 2398, 5015972, 128091434266, 39931856138212664, 151966368274993474937668, 7059965159455454640307807067492, 4003910412343921295679925280332950062686, 27719972687144020161876951888422165049044889741764

Offset: 1

Author

Andre Poenitz [André Pönitz], Peter Tittmann (poenitz(AT)htwm.de), Mar 03 2003

Keywords

• nonn

Links

• 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 von Algorithmen für die Berechnung von Invarianten in endlichen ungerichteten Hypergraphen, PhD Thesis (2004) C.3.
• Peter Tittmann, More Results [Gives a(1)-a(14)]

Crossrefs

Cf. A007341, A080691.

Extensions

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