On Tue, 28 Apr 2009 at 04:10PM -0700, William Stein wrote: > Maple 13 was released today, I think. The "new features" page is here: [...] > * The combinatorics package now includes the Eulerian numbers of > first and second order. [...] > I don't know anything about Eulerian numbers.
def eulerian1(n, k):
return Permutations(n).filter(lambda p: p.number_of_descents() ==
k).cardinality()
Now you know something about Eulerian numbers. :)
There's also a simple Pascal-like recursion.
Dan
--
--- Dan Drake <dr...@kaist.edu>
----- KAIST Department of Mathematical Sciences
------- http://mathsci.kaist.ac.kr/~drake
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