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A273183
The H_3-Eulerian numbers.
1
OFFSET
0,2
COMMENTS
a(n) is the number of elements of the Weyl group H_3 that have a descent set of size n.
Sum_{n=0..3} a(n) = 120, which is the order of the group H_3.
REFERENCES
T. K. Petersen, Eulerian Numbers, Birkhauser, 2015, Table 11.5.
KEYWORD
nonn,fini,full
AUTHOR
Tom Edgar, May 17 2016
STATUS
approved