Number of permutations of n copies of 1..7 introduced in order 1..7 with no element equal to another within a distance of 1.
A190927
Number of permutations of n copies of 1..7 introduced in order 1..7 with no element equal to another within a distance of 1.
Terms
- a(0) =1a(1) =47844a(2) =4420321081
External references
- oeis: A190927