24548655

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=31A001590
• a(n) = Sum_{k=0..n} T(n, k), array T as in A047080.at n=28A047081
• Expansion of (1-x)/(1+x-x^2+x^3).at n=28A078042