Number of permutations of 1..n with the sequence of sums of 2 adjacent elements having exactly 2 maxima.
A179711
Number of permutations of 1..n with the sequence of sums of 2 adjacent elements having exactly 2 maxima.
Terms
- a(0) =0a(1) =6a(2) =60a(3) =500a(4) =3640a(5) =25410a(6) =172620a(7) =1164492a(8) =7850304a(9) =53178972a(10) =362810448a(11) =2495592528a(12) =17313238800a(13) =121098656250
External references
- oeis: A179711