149175

Appears in sequences

• a(n) = n*(2*n+1)*binomial(n+2,n)/3.at n=25A289643
• a(n) = H(n-1, n, n+1) where H(a, b, c) = (a + b + c)*(a + b - c)*(b + c - a)*(c + a - b) is Heron's polynomial.at n=15A339488