Number of cyclic arrangements of S={1,2,...,n} such that the difference between any two neighbors is at least 3.

A242523

Number of cyclic arrangements of S={1,2,...,n} such that the difference between any two neighbors is at least 3.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =1a(7) =11a(8) =125a(9) =1351a(10) =15330a(11) =184846a(12) =2382084a(13) =32795170a(14) =481379278a(15) =7513591430a(16) =124363961357

External references