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Search: id:A078483
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| A078483 |
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Number of data structures of a certain wreath product type. |
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+0
1
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| 1, 1, 2, 6, 20, 69, 243, 869, 3145, 11491, 42312, 156807, 584288, 2187298, 8221257, 31009841, 117331070, 445174418, 1693270531, 6454992143, 24657428519, 94363587324, 361741068087, 1388892123038, 5340282880156, 20560742443041, 79259430563491, 305889059254747
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OFFSET
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0,3
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REFERENCES
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M. D. Atkinson and T. Stitt, Restricted permutations and the wreath product, Discrete Math., 259 (2002), 19-36.
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FORMULA
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G.f.: -2*x/(1-5*x-(1-4*x)^(1/2)+x*(1-4*x)^(1/2)+2*x^2).
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CROSSREFS
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Sequence in context: A082679 A094854 A026029 this_sequence A163135 A047036 A148478
Adjacent sequences: A078480 A078481 A078482 this_sequence A078484 A078485 A078486
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Jan 04 2003
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