145750

Appears in sequences

• Stirling numbers of the second kind, S(n,4).at n=7A000453
• Triangle of Stirling numbers of the second kind, S2(n,k), n >= 1, 1 <= k <= n.at n=58A008277
• Stirling numbers of second kind S2(11,n).at n=3A011560
• Number of primitive (aperiodic) word structures of length n which contain exactly four different symbols.at n=10A056280
• Number of palindromic structures using exactly four different symbols.at n=20A056473
• Number of palindromic structures using exactly four different symbols.at n=21A056473
• Number of periodic palindromic structures of length n using exactly four different symbols.at n=20A056510
• 4th level triangle related to Eulerian numbers and binomial transforms (A062254 is third level, A062253 is second level, triangle of Eulerian numbers is first level and triangle with Z(0,0)=1 and Z(n,k)=0 otherwise is 0th level).at n=28A062255
• Irregular triangle read by rows, Stirling numbers of the second kind: columns shifted to allow (1, 1, 2, 2, 3, 3, ...) terms per row.at n=52A136011
• Triangle read by rows: T(n,k) is the number of primitive (aperiodic) word structures of length n using exactly k different symbols.at n=58A137651
• Expansion of (1-x)/((1-2*x)*(1-5*x+6*x^2-x^3)).at n=9A234267
• Triangle read by rows: T(n,m) (n >= 1, 1 <= m <= n) = number of set partitions of [n], avoiding 123454, with m blocks.at n=58A250119
• Number of partitions of a {3*n-1}-set into n nonempty subsets.at n=3A274713
• Even numbers in the triangle of Stirling numbers of the second kind (A008277).at n=16A348650
• Array read by rows: T(n,k) for k <= min(n,10) is the number of digital types of length n with exactly k distinct decimal digits without common prime factors of a different digital type.at n=58A378154