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Search: id:A003580
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A003580 Dowling numbers. +0
1
1, 2, 12, 120, 1424, 19488, 307904, 5539712, 111259904, 2454487552, 58847153152, 1522019629056, 42209521995776, 1248370355347456, 39186678731423744, 1300179383923212288, 45436201241711542272 (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 + 1/8 exp(8 z) - 1/8).

CROSSREFS

Sequence in context: A089431 A119701 A127112 this_sequence A052580 A134095 A052680

Adjacent sequences: A003577 A003578 A003579 this_sequence A003581 A003582 A003583

KEYWORD

nonn

AUTHOR

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

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Last modified December 17 13:29 EST 2009. Contains 170826 sequences.


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