Number of inequivalent non-crossing partitions of n (equally spaced) points on a circle, under rotations and reflections.

A111275

Number of inequivalent non-crossing partitions of n (equally spaced) points on a circle, under rotations and reflections.

Terms

    a(0) =1a(1) =2a(2) =3a(3) =6a(4) =10a(5) =24a(6) =49a(7) =130a(8) =336a(9) =980a(10) =2904a(11) =9176a(12) =29432a(13) =97356a(14) =326399a(15) =1111770a(16) =3825238a(17) =13293456a(18) =46553116a(19) =164200028a(20) =582706692a(21) =2079517924a(22) =7458493728a(23) =26874412064a(24) =97241528200a(25) =353223728624

External references