Number of (s(0), s(1), ..., s(n)) such that 0 < s(i) < 6 and |s(i) - s(i-1)| <= 1 for i = 1,2,...,n, s(0) = 2, s(n) = 5.

A094309

Number of (s(0), s(1), ..., s(n)) such that 0 < s(i) < 6 and |s(i) - s(i-1)| <= 1 for i = 1,2,...,n, s(0) = 2, s(n) = 5.

Terms

    a(0) =1a(1) =4a(2) =14a(3) =44a(4) =132a(5) =384a(6) =1096a(7) =3088a(8) =8624a(9) =23936a(10) =66144a(11) =182208a(12) =500800a(13) =1374208a(14) =3766400a(15) =10313984a(16) =28226304a(17) =77211648a(18) =211138048a(19) =577223680a(20) =1577772032a(21) =4312088576a(22) =11783915520a(23) =32200396800a(24) =87985401856a(25) =240405151744

External references