83047505

Appears in sequences

• Tribonacci numbers: a(n) = a(n-1) + a(n-2) + a(n-3) with a(0)=0, a(1)=1, a(2)=0.at n=33A001590
• a(n) = Sum_{k=0..n} T(n, k), array T as in A047080.at n=30A047081
• Expansion of (1-x)/(1+x-x^2+x^3).at n=30A078042
• Coefficient of x in the reduction of the polynomial (x^2 + x + 1)^n by x^3 -> x^2 + x + 1.at n=11A192807