A014982 - OEIS

%I #8 Aug 15 2015 09:04:16

%S 1,1,2,12,272,21666

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

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

%H L. J. Billera and B. Sturmfels, <a href="http://dx.doi.org/10.1112/S0025579300007440">Iterated fiber polytopes</a>, Mathematika, 41 (1994), no. 2, 348-363.

%K nonn,more

%O 1,3

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