173264domain: NAppears in sequencesa(n) = Sum_{0<j<k<=n} k^3-j^3.at n=14A206809Expansion of (1 + 4*x - 20*x^2 + 8*x^3 + 33*x^4 - 4*x^5 - 33*x^6)/(1 - 2*x)^4.at n=10A339029a(n) = Sum_{k=0..floor(n/2)} binomial(n+k-1,k) * binomial(k,n-2*k).at n=13A389289