Number of permutations P of 1..n such that in P and in the inverse of P, every pair of adjacent numbers are relatively prime.
A117541
Number of permutations P of 1..n such that in P and in the inverse of P, every pair of adjacent numbers are relatively prime.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =9a(4) =56a(5) =23a(6) =399a(7) =442a(8) =2220a(9) =2386a(10) =71577a(11) =22001a(12) =1179483a(13) =1156519a(14) =4975079
External references
- oeis: A117541