Number of (s(0), s(1), ..., s(2n)) such that 0 < s(i) < 7 and |s(i) - s(i-1)| = 1 for i = 1,2,...,2*n, s(0) = 1, s(2n) = 3.

A094790

Number of (s(0), s(1), ..., s(2n)) such that 0 < s(i) < 7 and |s(i) - s(i-1)| = 1 for i = 1,2,...,2*n, s(0) = 1, s(2n) = 3.

Terms

    a(0) =1a(1) =3a(2) =9a(3) =28a(4) =89a(5) =286a(6) =924a(7) =2993a(8) =9707a(9) =31501a(10) =102256a(11) =331981a(12) =1077870a(13) =3499720a(14) =11363361a(15) =36896355a(16) =119801329a(17) =388991876a(18) =1263047761a(19) =4101088878a(20) =13316149700a(21) =43237262993a(22) =140390505643a(23) =455845099957

External references