Number of runs or rising sequences of length 2 among all permutations of n.
A141052
Number of runs or rising sequences of length 2 among all permutations of n.
Terms
- a(0) =1a(1) =4a(2) =21a(3) =130a(4) =930a(5) =7560a(6) =68880a(7) =695520a(8) =7711200a(9) =93139200a(10) =1217462400a(11) =17124307200a(12) =257902444800
External references
- oeis: A141052