Number of matrices with elements 1..n in which every pair of adjacent elements are relatively prime.
A168078
Number of matrices with elements 1..n in which every pair of adjacent elements are relatively prime.
Terms
- a(0) =1a(1) =4a(2) =12a(3) =32a(4) =144a(5) =176a(6) =1728a(7) =4320a(8) =27936
External references
- oeis: A168078