475042domain: NAppears in sequencesa(n) = 2*a(n-1) + a(floor(n/2)), with a(1) = 1, a(2) = 2, a(3) = 4.at n=18A033497Number of length n+6 0..7 arrays with every seven consecutive terms having six times some element equal to the sum of the remaining six.at n=7A249358