171080domain: NAppears in sequencesa(n) = n*(n+1)*(n+2)*(n+4)*(n+23)/120.at n=23A101855Nonnegative values x of solutions (x, y) to the Diophantine equation x^2+(x+601)^2 = y^2.at n=10A111258Numbers k such that binomial(k^2,k) == 0 (mod k^3).at n=30A371474a(n) = Sum_{k=0..floor(n/3)} binomial(n,k) * binomial(2*k,n-3*k).at n=16A389125