51336

Appears in sequences

• Coefficient of x^4 in expansion of (1+x+x^2)^n.at n=30A005712
• Numbers k such that k-th and (k+1)-st term of A038593 differ by 3.at n=36A038634
• Number of 2 X 2 matrices with all elements in {0,1,...,n} and nonnegative even determinant.at n=19A210371
• Expansion of 1/(1 - Sum_{k>=0} x^((2*k+1)^2)).at n=60A280863
• a(n) = trinomial(2*n, 4) = (1/6)*n*(2*n - 1)*(2*n^2 + 7*n - 3).at n=16A302710
• Starts of runs of 3 consecutive base phi Niven numbers (A334308).at n=4A334310