-14762

Appears in sequences

• a(n) = (1 - (-3)^n)/4.at n=10A014983
• Gaussian binomial coefficient [ n,9 ] for q=-3.at n=1A015375
• Triangle read by rows: T(n,k) is the coefficient A_k in the transformation of 1 + x + x^2 + ... + x^n to the polynomial A_k*(x+3)^k for 0 <= k <= n.at n=45A248811
• Triangle, read by rows, defined by recurrence: T(n,k) = T(n-1,k-1) + (-1)^k * (2 * k + 1) * T(n-1,k) for 0 < k < n with initial values T(n,0) = T(n,n) = 1 for n >= 0 and T(i,j) = 0 if j < 0 or j > i.at n=56A346083