Number of permutations of 3 copies of 1..n introduced in order 1..n with no element equal to another within a distance of 3.
A190828
Number of permutations of 3 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) =436a(5) =105876a(6) =27361381a(7) =8448460856
External references
- oeis: A190828