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A080691 Number of spanning forests of the n X n grid graph. 0
1, 15, 3102, 8790016, 341008617408, 181075508242067552, 1315927389374152034113856, 130877523274817580209987036404864, 178135975585132088643635627145305047963624 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..9.

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: A108281 A232455 A208579 * A208584 A211903 A278630

Adjacent sequences:  A080688 A080689 A080690 * A080692 A080693 A080694

KEYWORD

nonn

AUTHOR

Andre Poenitz [Po"nitz], Peter Tittmann, Mar 03 2003

STATUS

approved

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Last modified September 24 02:52 EDT 2021. Contains 347620 sequences. (Running on oeis4.)