Number of (s(0), s(1), ..., s(2n)) such that 0 < s(i) < 9 and |s(i) - s(i-1)| = 1 for i = 1,2,...,2n, s(0) = 3, s(2n) = 3.

A094831

Number of (s(0), s(1), ..., s(2n)) such that 0 < s(i) < 9 and |s(i) - s(i-1)| = 1 for i = 1,2,...,2n, s(0) = 3, s(2n) = 3.

Terms

    a(0) =1a(1) =2a(2) =6a(3) =19a(4) =62a(5) =207a(6) =703a(7) =2417a(8) =8382a(9) =29242a(10) =102431a(11) =359790a(12) =1266103a(13) =4460939a(14) =15730497a(15) =55500634a(16) =195890270a(17) =691566411a(18) =2441886670a(19) =8623112591a(20) =30453261927a(21) =107553444913a(22) =379864424726

External references