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Search: id:A078482
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| A078482 |
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Number of data structures of a certain wreath product type. |
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+0
1
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| 0, 1, 2, 6, 20, 70, 254, 948, 3618, 14058, 55432, 221262, 892346, 3630680, 14885042, 61432382, 255025212, 1064190214, 4461325382, 18780710508, 79357572866, 336466650450, 1431007889744, 6103431668830, 26099839562738, 111877997049648, 480635694869218
(list; graph; listen)
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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.: (1-3*x+x^2-(1-6*x+7*x^2-2*x^3+x^4)^(1/2))/(2*x).
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CROSSREFS
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Sequence in context: A151284 A049138 A095929 this_sequence A049128 A049140 A092413
Adjacent sequences: A078479 A078480 A078481 this_sequence A078483 A078484 A078485
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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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