130480

Appears in sequences

• Triangle read by rows: T(n,k) = number of noncommutative symmetric polynomials of degree n that have exactly k different variables appearing in each monomial and which generate the algebra of all noncommutative symmetric polynomials (n >= 1, 1 <= k <= n).at n=60A055105
• Triangle T(n,k) giving number of symmetric polynomials of degree n in k noncommuting variables, n >=2, 2 <= k <= n.at n=49A055106
• Triangle T(k,n) giving number of symmetric polynomials of degree n in k noncommuting variables, n >=2, 2 <= k <= n.at n=50A055107
• Numbers k such that 4*10^k+9 is prime.at n=15A101394
• n*(1+3*n+6*n^2)/2.at n=35A115519
• Number of ways to place 3 nonattacking knights on an n X n cylindrical board.at n=9A172965
• a(n) is the number of chiral pairs of color patterns (set partitions) in a row of length n using exactly 3 colors (subsets).at n=12A320526