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Search: id:A003581
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A003581 Dowling numbers. +0
1
1, 2, 13, 143, 1852, 27563, 473725, 9290396, 203745235, 4912490375, 128777672338, 3643086083981, 110557605978901, 3579776914324250, 123074955978249433, 4474133111905169219, 171363047274358839412 (list; graph; listen)
OFFSET

0,2

REFERENCES

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

FORMULA

E.g.f.: exp(z + 1/9 exp(9 z) - 1/9).

CROSSREFS

Sequence in context: A143137 A003414 A003326 this_sequence A129256 A046245 A107699

Adjacent sequences: A003578 A003579 A003580 this_sequence A003582 A003583 A003584

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified November 24 23:16 EST 2009. Contains 167481 sequences.


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