Number of partitions of sets containing from 0 to n elements into blocks of at least 2 elements.
A160181
Number of partitions of sets containing from 0 to n elements into blocks of at least 2 elements.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =7a(5) =18a(6) =59a(7) =221a(8) =936a(9) =4361a(10) =22083a(11) =120336a(12) =700653a(13) =4333933a(14) =28345090a(15) =195233255a(16) =1411303635a(17) =10675375402a(18) =84276173439a(19) =692752181561
External references
- oeis: A160181