A140980 - OEIS

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A140980 - OEIS

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A140980

Number of (4,2)-noncrossing partitions of [n].

1

1, 1, 2, 5, 15, 52, 202, 856, 3868, 18313, 89711, 450825, 2310453

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OFFSET

0,3

LINKS

Table of n, a(n) for n=0..12.

Toufik Mansour and Simone Severini, Enumeration of (k,2)-noncrossing partitions, Discrete Math., 308 (2008), 4570-4577.

CROSSREFS

A row of A125311.

Sequence in context: A279559 A359191 A056272 * A287254 A220912 A108304

Adjacent sequences: A140977 A140978 A140979 * A140981 A140982 A140983

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Sep 04 2008

STATUS

approved