cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-5 of 5 results.

A273035 The E_7-Eulerian numbers.

Original entry on oeis.org

1, 17635, 309969, 1123915, 1123915, 309969, 17635, 1
Offset: 0

Views

Author

Tom Edgar, May 13 2016

Keywords

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

Cf. A008292, A060187, A066094, A273000.

A273036 The E_8-Eulerian numbers.

Original entry on oeis.org

1, 881752, 28336348, 169022824, 300247750, 169022824, 28336348, 881752, 1
Offset: 0

Views

Author

Tom Edgar, May 13 2016

Keywords

Comments

a(n) is the number of elements of the Weyl group E_8 that have a descent set of size n.
Sum_{n=0..8} a(n) = 696729600, which is the order of the group E_8.

References

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

Crossrefs

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

A273181 The F_4-Eulerian numbers.

Original entry on oeis.org

1, 236, 678, 236, 1
Offset: 0

Views

Author

Tom Edgar, May 17 2016

Keywords

Comments

a(n) is the number of elements of the Weyl group F_4 that have a descent set of size n.
Sum_{n=0..4} a(n) = 1152, which is the order of the group F_4.

References

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

Crossrefs

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

A273183 The H_3-Eulerian numbers.

Original entry on oeis.org

1, 59, 59, 1
Offset: 0

Views

Author

Tom Edgar, May 17 2016

Keywords

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.

A273184 The H_4-Eulerian numbers.

Original entry on oeis.org

1, 2636, 9126, 2636, 1
Offset: 0

Views

Author

Tom Edgar, May 17 2016

Keywords

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.

Crossrefs

Cf. A008292, A060187, A066094, A273000, A273035, A273036, A273181, A273183.
Showing 1-5 of 5 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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