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

A303931

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

Terms

    a(0) =1a(1) =0a(2) =1a(3) =1a(4) =2a(5) =2a(6) =5a(7) =6a(8) =14a(9) =22a(10) =51a(11) =95a(12) =232a(13) =498a(14) =1239a(15) =2953a(16) =7520a(17) =18920a(18) =49235a(19) =127917a(20) =338094a(21) =896060a(22) =2397627a(23) =6439730a(24) =17403252a(25) =47207620a(26) =128628877a(27) =351676075a(28) =964909660a(29) =2655474962

External references