Number of cyclic arrangements of S={1,2,...,n} such that the difference between any two neighbors is at least 4.

A242524

Number of cyclic arrangements of S={1,2,...,n} such that the difference between any two neighbors is at least 4.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =0a(8) =1a(9) =24a(10) =504a(11) =8320a(12) =131384a(13) =2070087a(14) =33465414a(15) =561681192a(16) =9842378284a(17) =180447203232

External references