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) = 3, s(2n) = 5.

A094821

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) = 3, s(2n) = 5.

Terms

    a(0) =1a(1) =4a(2) =15a(3) =54a(4) =190a(5) =660a(6) =2276a(7) =7816a(8) =26776a(9) =91600a(10) =313104a(11) =1069728a(12) =3653728a(13) =12477504a(14) =42606656a(15) =145479808a(16) =496722304a(17) =1695962368a(18) =5790470400a(19) =19770087936a(20) =67499673088a(21) =230459040768a(22) =786837865472

External references