Number of permutations of n copies of 1..5 introduced in order 1..5 with no element equal to another within a distance of 3.

A190922

Number of permutations of n copies of 1..5 introduced in order 1..5 with no element equal to another within a distance of 3.

Terms

    a(0) =1a(1) =20a(2) =436a(3) =9993a(4) =238856a(5) =5904049a(6) =149981369a(7) =3897334810a(8) =103211369665

External references