Number of (s(0), s(1), ..., s(2n)) such that 0 < s(i) < 8 and |s(i) - s(i-1)| = 1 for i = 1,2,...,2n, s(0) = 1, s(2n) = 3.

A094803

Number of (s(0), s(1), ..., s(2n)) such that 0 < s(i) < 8 and |s(i) - s(i-1)| = 1 for i = 1,2,...,2n, s(0) = 1, s(2n) = 3.

Terms

    a(0) =1a(1) =3a(2) =9a(3) =28a(4) =90a(5) =296a(6) =988a(7) =3328a(8) =11272a(9) =38304a(10) =130416a(11) =444544a(12) =1516320a(13) =5174144a(14) =17659840a(15) =60282880a(16) =205795456a(17) =702583296a(18) =2398676736a(19) =8189409280a(20) =27960021504a(21) =95460743168a(22) =325921881088

External references