Number of permutations of 1..n arranged in a circle with exactly 4 adjacent element pairs in decreasing order.
A151577
Number of permutations of 1..n arranged in a circle with exactly 4 adjacent element pairs in decreasing order.
Terms
- a(0) =0a(1) =5a(2) =156a(3) =2114a(4) =19328a(5) =140571a(6) =882340a(7) =5007112a(8) =26441856a(9) =132439905a(10) =637468300a(11) =2976161790a(12) =13569454592a(13) =60725449335a(14) =267757190100
External references
- oeis: A151577