Number of classifications of n elements.

A005646

Number of classifications of n elements.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =3a(4) =6a(5) =26a(6) =122a(7) =1015a(8) =11847a(9) =208914a(10) =5236991a(11) =184321511

External references