4213596

Appears in sequences

• a(n) = Sum_{d | n} mu(n/d) * Bell(d-1).at n=12A034743
• a(n) = B(n) - 1, where B(n) = Bell numbers, A000110.at n=10A058692
• Number of set partitions of {1, ..., n} that avoid 6-nestings.at n=12A192127
• Number of arrays of n 0..10 integers with new values introduced in order 0..10 but otherwise unconstrained.at n=11A203641
• Number of primitive (aperiodic) palindromic structures of length n using an infinite alphabet.at n=22A284841
• Number of primitive (period n) periodic palindromic structures of length n using an infinite alphabet.at n=23A285042
• Number of set partitions of [n] such that all absolute differences between least elements of consecutive blocks are <= ten.at n=12A287260
• Number of set partitions of [n] such that j is member of block b only if b = 1 or at least one of j-1, ..., j-9 is member of a block >= b-1.at n=12A287672