57816

Appears in sequences

• Coefficient of x^4 in expansion of (1+x+x^2)^n.at n=31A005712
• Triangle read by rows: T(n,k) is the number of Dyck paths of semilength n having exactly k UUU's (triple rises) where U=(1,1). Rows have 1,1,1,2,3,4,5,... entries, respectively.at n=59A092107
• TrueSoFar number of terms in other bases.at n=21A102844
• Sum of the principal diagonals of a 2n X 2n square spiral.at n=22A137931
• a(n) = 6*n*(9*n-5).at n=33A277984
• a(n) = Trinomial(2*n+1, 4) = (1/6)*n*(2*n + 1)*(2*n^2 + 9*n + 1), n >= 0.at n=16A302709
• Numbers k such that k and k + 1 have the same norm of the sum of unitary divisors in Gaussian integers (A332474).at n=8A332475