7173360

Appears in sequences

• Expansion of 1/((1-3*x)*(1-9*x)).at n=7A016142
• Number of primitive (aperiodic) word structures of length n using a 3-ary alphabet.at n=15A056274
• Number of primitive (aperiodic) palindromic structures using a maximum of three different symbols.at n=32A056477
• a(n) = n! * Sum_{i+2j+3k=n} 1/(i!*(2j)!*(3k)!).at n=16A094717
• a(n) = Sum_{d|n} Moebius(n/d)*d^(b-1)/phi(n) for b = 9.at n=8A160908
• Expansion of x^2/((3*x-1)*(3*x^2-1)).at n=16A167993
• Smallest pentagonal number with n prime factors (counted with multiplicity).at n=13A209049
• Triangular array read by rows: T(n,k) is the number of n X n idempotent matrices over GF(3) having rank k, n>=0, 0<=k<=n.at n=37A378666
• Triangular array read by rows: T(n,k) is the number of n X n idempotent matrices over GF(3) having rank k, n>=0, 0<=k<=n.at n=43A378666