25501368320domain: NAppears in sequencesa(n) = 2^(n - 2)*(binomial(n,2) + 2).at n=27A104270a(0) = 1, a(1) = 4, a(2) = 11, and a(n) = 4*a(n-1) - 4*a(n-2) for n >= 3.at n=30A339252