A273184 The H_4-Eulerian numbers.

1, 2636, 9126, 2636, 1

Offset

0,2

Comments

a(n) is the number of elements of the Weyl group H_4 that have a descent set of size n.

Sum_{n=0..4} a(n) = 14400, which is the order of the group H_4.

References

T. K. Petersen, Eulerian Numbers, Birkhauser, 2015, Table 11.5.

Links

Table of n, a(n) for n=0..4.

Crossrefs

Cf. A008292, A060187, A066094, A273000, A273035, A273036, A273181, A273183.

Sequence in context: A254722 A236502 A212605 * A252579 A253040 A157609

Adjacent sequences: A273181 A273182 A273183 * A273185 A273186 A273187

Keyword

nonn,fini,full

Author

Tom Edgar, May 17 2016

Status

approved