137560

Appears in sequences

• a(n) = n^4 + n^3 + n^2 + n.at n=19A027445
• a(0)=0, a(1)=1, a(2n)=19*a(n), a(2n+1)=a(2n)+1.at n=30A197353
• a(n) = Sum_{k=0..floor(n/4)} 2^(n-4*k) * binomial(2*n-6*k,2*k).at n=13A387691