A014982 Number of "coherent" reduced decompositions for the longest permutation n n-1 n-2 ... 3 2 1 in the symmetric group on n letters.

1, 1, 2, 12, 272, 21666

Offset

1,3

Comments

For definition of "coherent", see L J. Billera and B. Sturmfels link.

Links

Table of n, a(n) for n=1..6.

L. J. Billera and B. Sturmfels, Iterated fiber polytopes, Mathematika, 41 (1994), no. 2, 348-363.

Crossrefs

Sequence in context: A091504 A098137 A214005 * A012444 A012754 A083568

Adjacent sequences: A014979 A014980 A014981 * A014983 A014984 A014985

Keyword

nonn,more

Author

Victor Reiner (reiner(AT)math.umn.edu)

Status

approved