Number of permutations of length n with no consecutive triples i,i+d,i+2d for all d>0.
A174080
Number of permutations of length n with no consecutive triples i,i+d,i+2d for all d>0.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =21a(5) =100a(6) =597a(7) =4113a(8) =32842a(9) =292379a(10) =2925367a(11) =31983248a(12) =383514347a(13) =4966286235a(14) =69508102006
External references
- oeis: A174080