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) = 3.

A094817

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) = 3.

Terms

    a(0) =2a(1) =6a(2) =19a(3) =62a(4) =206a(5) =692a(6) =2340a(7) =7944a(8) =27032a(9) =92112a(10) =314128a(11) =1071776a(12) =3657824a(13) =12485696a(14) =42623040a(15) =145512576a(16) =496787840a(17) =1696093440a(18) =5790732544a(19) =19770612224a(20) =67500721664a(21) =230461137920a(22) =786842059776

External references