Number of permutations of length n with no consecutive triples i,...i+r,...i+2r for all positive r, and for all equal spacings d.

A174084

Number of permutations of length n with no consecutive triples i,...i+r,...i+2r for all positive r, and for all equal spacings d.

Terms

    a(0) =21a(1) =94a(2) =544a(3) =3509a(4) =26799a(5) =223123a(6) =2133511a(7) =21793042a(8) =248348572a(9) =3008632130a(10) =39989075942a(11) =558800689295

External references