428652

Appears in sequences

• Triangle T(n, k) = (binomial(n-1, k-1)*binomial(n, k-1)/k) * ( 3^(k-1) if floor(n/2) >= k, otherwise 3^(n-k) ), read by rows.at n=49A174346
• Triangle T(n, k) = (binomial(n-1, k-1)*binomial(n, k-1)/k) * ( 3^(k-1) if floor(n/2) >= k, otherwise 3^(n-k) ), read by rows.at n=50A174346
• Number of chordless cycles in the complete tripartite graph K_{n,n,n}.at n=27A297662
• Triangular array read by rows: row n shows the coefficients of the polynomial p(x,n) constructed as in Comments; these polynomials form a strong divisibility sequence.at n=42A327321
• Triangular array read by rows: row n shows the coefficients of the polynomial p(x,n) constructed as in Comments; these polynomials form a strong divisibility sequence.at n=42A328644
• a(n) = [(x*y*z*u)^n] 1/((1-(x+y+z+u))*(1-x*y-z*u)).at n=3A381184