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Search: id:A071075
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| A071075 |
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Number of permutations that avoid the generalized pattern 132-4. |
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+0
4
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| 1, 1, 2, 6, 23, 107, 585, 3671, 25986, 204738, 1776327
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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) = 1/(1-int(exp(t^2/2), t=0..y))
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MAPLE
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A(y) := 1/(1-int(exp(-t^2/2), t=0..y)); B(x) := exp(int(A(y), y=0..x)); series(B(x), x=0, 30);
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CROSSREFS
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Cf. A071088, A071076, A071077.
Sequence in context: A130908 A000772 A113226 this_sequence A007555 A101053 A071076
Adjacent sequences: A071072 A071073 A071074 this_sequence A071076 A071077 A071078
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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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