Number of permutations of 1..n with the sequence of sums of 4 adjacent elements having exactly 2 maxima.
A179721
Number of permutations of 1..n with the sequence of sums of 4 adjacent elements having exactly 2 maxima.
Terms
- a(0) =0a(1) =180a(2) =2520a(3) =25200a(4) =211680a(5) =1839600a(6) =17186400a(7) =168168000a(8) =1676875200a(9) =16972355400
External references
- oeis: A179721