Number of permutations of 1..n with all differences of elements separated by distances 1 through 7 being respectively unique.

A170813

Number of permutations of 1..n with all differences of elements separated by distances 1 through 7 being respectively unique.

Terms

    a(0) =1a(1) =2a(2) =4a(3) =12a(4) =40a(5) =116a(6) =200a(7) =444a(8) =760a(9) =2160a(10) =4368a(11) =7852a(12) =12828a(13) =17252a(14) =19612a(15) =21104a(16) =19760a(17) =20392a(18) =20128a(19) =20636a(20) =22408a(21) =23988

External references