Number of permutations of 1..n such that |p(i)-p(i-1)| >= 5 for i>1.
A179958
Number of permutations of 1..n such that |p(i)-p(i-1)| >= 5 for i>1.
Terms
- a(0) =1a(1) =1a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =0a(8) =0a(9) =0a(10) =2a(11) =160a(12) =6056a(13) =161136a(14) =3661824a(15) =76972416a(16) =1572313392a(17) =32096768008a(18) =665456850864
External references
- oeis: A179958