Number of permutations of n copies of 1..6 introduced in order 1..6 with no element equal to another within a distance of 2.

A190924

Number of permutations of n copies of 1..6 introduced in order 1..6 with no element equal to another within a distance of 2.

Terms

    a(0) =1a(1) =1146a(2) =2001240a(3) =4336589521

External references