110409

Appears in sequences

• Coefficient of x^4 in expansion of (1+x+x^2)^n.at n=37A005712
• a(n) = (4*n^3 + n^2 - 3*n)/2.at n=38A172073
• a(n) = ceiling((2n+1/n)^n).at n=4A197716
• a(n) = Trinomial(2*n+1, 4) = (1/6)*n*(2*n + 1)*(2*n^2 + 9*n + 1), n >= 0.at n=19A302709