Number of permutations of length n with no consecutive triples i,i+2,i+4 (mod n) or i,i-2,i-4 (mod n).
A174077
Number of permutations of length n with no consecutive triples i,i+2,i+4 (mod n) or i,i-2,i-4 (mod n).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =0a(4) =24a(5) =80a(6) =504a(7) =3794a(8) =31616a(9) =290970a(10) =2973600a(11) =33311520a(12) =405781344a(13) =5342413414a(14) =75612197528
External references
- oeis: A174077