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A078487
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Generating function for a certain wreath product.
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0
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0, 1, 2, 6, 23, 100, 464, 2236, 11048, 55588, 283648, 1463868, 7626296, 40049188, 211768752, 1126513788, 6024316488, 32368294756, 174645900768, 945893037948, 5140619493464, 28024941448420, 153219244012432, 839884005112636, 4615012956649832, 25415266785076900
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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REFERENCES
| M. D. Atkinson and T. Stitt, Restricted permutations and the wreath product, Discrete Math., 259 (2002), 19-36.
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FORMULA
| G.f.: (1-9*x+29*x^2-30*x^3+10*x^4-x^5-(1-6*x+x^2)^(1/2)*(1-6*x+13*x^2-7*x^3+x^4))/(2*x).
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CROSSREFS
| Sequence in context: A196018 A009449 A133656 * A193038 A120346 A050389
Adjacent sequences: A078484 A078485 A078486 * A078488 A078489 A078490
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Jan 04 2003
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