A303931 Number of noncrossing partitions up to rotation and reflection of an n-set without singleton blocks.

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

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