146575domain: NAppears in sequencesa(n) = n*(n-1)*(2*n^2 + 1)/6.at n=26A071245a(n) = ceiling(Pi*n^3).at n=36A247194a(n) = a(n-1) + 3*a(n-2) -2*a(n-3) - 2*a(n-4), where a(0) = -2, a(1) = -1, a(2) = 0, a(3) = 1.at n=22A295861