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A007405 Dowling numbers: binomial transform of A004211.
(Formerly M1674)
+0
3
1, 2, 6, 24, 116, 648, 4088, 28640, 219920, 1832224, 16430176, 157554048, 1606879040, 17350255744, 197553645440, 2363935624704, 29638547505408, 388328781668864, 5304452565517824, 75381218537805824 (list; graph; listen)
OFFSET

0,2

REFERENCES

Benoumhani, Moussa; On Whitney numbers of Dowling lattices. Discrete Math. 159 (1996), no. 1-3, 13-33.

LINKS

T. D. Noe, Table of n, a(n) for n=0..100

N. J. A. Sloane, Transforms

FORMULA

E.g.f.: exp(z + 1/2 exp(2 z) - 1/2).

Row sums of triangles A039755, A039756 . - DELEHAM Philippe (kolotoko(AT)wanadoo.fr), Feb 20 2005

CROSSREFS

Adjacent sequences: A007402 A007403 A007404 this_sequence A007406 A007407 A007408

Sequence in context: A069657 A082631 A097483 this_sequence A079106 A088713 A135106

KEYWORD

nonn,nice

AUTHOR

njas

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Last modified October 12 15:26 EDT 2008. Contains 144830 sequences.


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