Number of permutations p of [n] such that |p(i) - p(i-1)| is in {2,7} for all i from 2 to n.

Terms

a(0) =1a(1) =1a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =0a(8) =2a(9) =18a(10) =12a(11) =0a(12) =12a(13) =62a(14) =76a(15) =32a(16) =44a(17) =162a(18) =600a(19) =714a(20) =386a(21) =550a(22) =2514a(23) =5320a(24) =4140a(25) =3336a(26) =8626a(27) =24722a(28) =33428a(29) =27110