23863649056domain: NAppears in sequencesa(n) = 2*a(n-1) + a(n-2) - 1, with a(0) = 0 and a(1) = 2.at n=28A353580a(n) = (A077446(n) + 1)/2 for n >= 0.at n=28A364319a(n) = a(n-1) + 3*a(n-2) + a(n-3) with a(0) = 1, a(1) = 3, a(2) = 6.at n=27A375726