Number of ways to partition n labeled elements into sets of different sizes of at least 2.

A032311

Number of ways to partition n labeled elements into sets of different sizes of at least 2.

Terms

    a(0) =1a(1) =0a(2) =1a(3) =1a(4) =1a(5) =11a(6) =16a(7) =57a(8) =85a(9) =1507a(10) =2896a(11) =12563a(12) =51074a(13) =138789a(14) =2954407a(15) =7959304a(16) =38908797a(17) =178913747a(18) =1100724688a(19) =3444477663a(20) =114462103390a(21) =358862880667

External references