Number of cyclic arrangements of S={1,2,...,n} such that the difference between any two neighbors is at least 2.

A242522

Number of cyclic arrangements of S={1,2,...,n} such that the difference between any two neighbors is at least 2.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =1a(5) =5a(6) =33a(7) =245a(8) =2053a(9) =19137a(10) =196705a(11) =2212037a(12) =27029085a(13) =356723177a(14) =5058388153a(15) =76712450925

External references