Number of permutations of 1..n with no adjacent elements within 6 in value.

A179960

Number of permutations of 1..n with no adjacent elements within 6 in value.

Terms

    a(0) =1a(1) =1a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =0a(8) =0a(9) =0a(10) =0a(11) =0a(12) =0a(13) =0a(14) =2a(15) =768a(16) =98408a(17) =6433728a(18) =305193408a(19) =11902581120a(20) =412583686272

External references