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A060622
Number of flips between the d-dimensional tilings of the unary zonotope Z(D,d). Here the codimension D-d is equal to 4 and d varies.
0
32, 240, 2144, 22624
OFFSET
0,1
REFERENCES
A. Bjorner, M. Las Vergnas, B. Sturmfels, N. White and G. M. Ziegler, Oriented Matroids, Encyclopedia of Mathematics 46, Second Edition, Cambridge University Press, 1999.
N. Destainville, R. Mosseri and F. Bailly, Fixed-boundary octagonal random tilings: a combinatorial approach, Journal of Statistical Physics, 102 (2001), no. 1-2, 147-190.
Victor Reiner, The generalized Baues problem, in New Perspectives in Algebraic Combinatorics (Berkeley, CA, 1996-1997), 293-336, Math. Sci. Res. Inst. Publ., 38, Cambridge Univ. Press, Cambridge, 1999.
EXAMPLE
For any Z(d,d), there is a unique tiling therefore the first term of the series is 0. Likewise, there are always two tilings of Z(d+1,d) with a flip between them, therefore the second term of the series is 1.
CROSSREFS
Cf. A060595 (number of 3-tilings) for terminology. A diagonal of A060638.
Sequence in context: A223250 A250748 A333268 * A118999 A321829 A111450
KEYWORD
nonn
AUTHOR
Matthieu Latapy (latapy(AT)liafa.jussieu.fr), Apr 13 2001
STATUS
approved