A303931 - OEIS

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A303931

Number of noncrossing partitions up to rotation and reflection of an n-set without singleton blocks.

3

1, 0, 1, 1, 2, 2, 5, 6, 14, 22, 51, 95, 232, 498, 1239, 2953, 7520, 18920, 49235, 127917, 338094, 896060, 2397627, 6439730, 17403252, 47207620, 128628877, 351676075, 964909660, 2655474962, 7329668097, 20285420790, 56284927718, 156539620498, 436343744531

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,5

LINKS

Andrew Howroyd, Table of n, a(n) for n = 0..200

PROG

(PARI) \\ See A303875 for NCPartitionsModDihedral

Vec(NCPartitionsModDihedral(vector(40, k, k>1))) \\ Andrew Howroyd, May 02 2018

CROSSREFS

Column k=0 of A211359.

Cf. A295198, A303875.

Sequence in context: A147766 A034420 A304867 * A028410 A050216 A345470

Adjacent sequences: A303928 A303929 A303930 * A303932 A303933 A303934

KEYWORD

nonn

AUTHOR

Andrew Howroyd, May 02 2018

STATUS

approved