Number of permutations of 4 copies of 1..n introduced in order 1..n with no element equal to another within a distance of 1.

A190830

Number of permutations of 4 copies of 1..n introduced in order 1..n with no element equal to another within a distance of 1.

Terms

    a(0) =1a(1) =0a(2) =1a(3) =182a(4) =94376a(5) =98371884a(6) =182502973885

External references