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A007976 Generalized Euler numbers. 0
1, 2, 5, 16, 61, 275, 1430, 8506, 57205 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

REFERENCES

A. A. Kirillov, Variations on the triangular theme, Amer. Math. Soc. Transl., (2), Vol. 169, 1995, pp. 43-73, see p. 52.

LINKS

Table of n, a(n) for n=1..9.

Marcelo Aguiar, Nantel Bergeron and Nathaniel Thiem, Hopf monoids from class functions on unitriangular matrices, arXiv preprint arXiv:1203.1572 [math.CO], 2012. - From N. J. A. Sloane, Sep 14 2012

A. A. Kirillov, On the combinatorics of coadjoint orbits, Funct. Anal. Applic., vol. 27 1992 pages 62-64.

EXAMPLE

a(7) is the number of conjugacy classes in a Borel subgroup of GL(7,2), also the number of complex irreducible representations and is easily computed by GAP to be 1430. - Dmitrii Pasechnik, Mar 27 2008

CROSSREFS

Sequence in context: A275711 A163747 A000111 * A058259 A033543 A124531

Adjacent sequences:  A007973 A007974 A007975 * A007977 A007978 A007979

KEYWORD

nonn,more

AUTHOR

Alexandre Kirillov (kirillov(AT)math.upenn.edu)

EXTENSIONS

a(7) corrected by Dmitrii Pasechnik, Mar 27 2008

STATUS

approved

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Last modified October 15 13:01 EDT 2018. Contains 316236 sequences. (Running on oeis4.)