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Number of noncrossing partitions up to rotation and reflection of an n-set without singleton blocks.
3

%I #7 May 03 2018 14:33:22

%S 1,0,1,1,2,2,5,6,14,22,51,95,232,498,1239,2953,7520,18920,49235,

%T 127917,338094,896060,2397627,6439730,17403252,47207620,128628877,

%U 351676075,964909660,2655474962,7329668097,20285420790,56284927718,156539620498,436343744531

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

%H Andrew Howroyd, <a href="/A303931/b303931.txt">Table of n, a(n) for n = 0..200</a>

%o (PARI) \\ See A303875 for NCPartitionsModDihedral

%o Vec(NCPartitionsModDihedral(vector(40, k, k>1))) \\ _Andrew Howroyd_, May 02 2018

%Y Column k=0 of A211359.

%Y Cf. A295198, A303875.

%K nonn

%O 0,5

%A _Andrew Howroyd_, May 02 2018