200048domain: NAppears in sequencesNumber of length-n binary vectors beginning with 0, ending with 1, and avoiding 6 consecutive 0's and 6 consecutive 1's.at n=20A283836G.f.: Sum_{n>=0} x^n * (1 + x^n)^n / (1 - x^(n+1))^(n+1).at n=80A325046