Number of permutations of n distinct letters (ABCD...) each of which appears thrice with n-4 fixed points.
A124008
Number of permutations of n distinct letters (ABCD...) each of which appears thrice with n-4 fixed points.
Terms
- a(0) =9a(1) =189a(2) =1431a(3) =5355a(4) =14310a(5) =31374a(6) =60354a(7) =105786a(8) =172935a(9) =267795a(10) =397089a(11) =568269
External references
- oeis: A124008