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Search: id:A071076
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| A071076 |
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Number of permutations that avoid the generalized pattern 123-4. |
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+0
4
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| 1, 1, 2, 6, 23, 108, 598, 3815, 27532, 221708, 1970251, 19150132, 202064380, 2300071071, 28092017668, 366425723926, 5083645400819, 74745472084176, 1160974832572274, 18995175706664735, 326531476287842760
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OFFSET
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0,3
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REFERENCES
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S. Kitaev, Partially Ordered Generalized Patterns, Discrete Math. 298 (2005), no. 1-3, 212-229.
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LINKS
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S. Kitaev, Partially Ordered Generalized Patterns
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FORMULA
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E.g.f.: exp(int(A(y), y=0..x)), where A(y) = (sqrt(3)/2)*exp(x/2)/cos((sqrt(3)/2)*x + Pi/6)
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CROSSREFS
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Cf. A071088, A071075, A071077.
Adjacent sequences: A071073 A071074 A071075 this_sequence A071077 A071078 A071079
Sequence in context: A071075 A007555 A101053 this_sequence A112501 A093345 A002136
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KEYWORD
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nonn
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AUTHOR
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Sergey Kitaev (kitaev(AT)math.chalmers.se), May 26 2002
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EXTENSIONS
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More terms from Vladeta Jovovic (vladeta(AT)Eunet.yu), May 28 2002
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