A273183 The H_3-Eulerian numbers.

1, 59, 59, 1

Offset: 0

Author

Tom Edgar, May 17 2016

Keywords

• nonn
• fini
• full

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.

Crossrefs

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