Number of permutations of n copies of 1..7 introduced in order 1..7 with no element equal to another within a distance of 3.

A190929

Number of permutations of n copies of 1..7 introduced in order 1..7 with no element equal to another within a distance of 3.

Terms

    a(0) =1a(1) =4317a(2) =27361381a(3) =216956034178

External references