Number of permutations of 4 copies of 1..n introduced in order 1..n with no element equal to another within a distance of 3.
A190832
Number of permutations of 4 copies of 1..n introduced in order 1..n with no element equal to another within a distance of 3.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =1a(4) =9993a(5) =44288275a(6) =216956034178
External references
- oeis: A190832