Number of permutations of length n with no consecutive triples i,i+2,i+4.
A174072
Number of permutations of length n with no consecutive triples i,i+2,i+4.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =24a(5) =114a(6) =674a(7) =4714a(8) =37754a(9) =340404a(10) =3412176a(11) =37631268a(12) =452745470a(13) =5900431012a(14) =82802497682
External references
- oeis: A174072