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
Keywords
Links
- Andrew Howroyd, Table of n, a(n) for n = 0..200
Programs
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PARI
\\ See A303875 for NCPartitionsModDihedral Vec(NCPartitionsModDihedral(vector(40, k, k>1))) \\ Andrew Howroyd, May 02 2018