OFFSET
0,2
COMMENTS
a(n) is the number of elements of the Weyl group E_7 that have a descent set of size n.
Sum_{n=0..7} a(n) = 2903040, which is the order of the group E_7.
REFERENCES
T. K. Petersen, Eulerian Numbers, Birkhauser, 2015, Table 11.5.
CROSSREFS
KEYWORD
nonn,fini,full
AUTHOR
Tom Edgar, May 13 2016
STATUS
approved