303025

Appears in sequences

• a(n) = n*(n - 1)*(2*n^2 + n + 2)/6.at n=31A071246
• a(n) = 5*a(n-3) - a(n-6) with terms 1..6 as 0, 1, 2, 5, 7, 9.at n=24A142879