Number of permutations of 1..n with the sum of squared adjacent differences < (n-1)*n*(n+1)/6.
A180073
Number of permutations of 1..n with the sum of squared adjacent differences < (n-1)*n*(n+1)/6.
Terms
- a(0) =0a(1) =2a(2) =12a(3) =56a(4) =344a(5) =2486a(6) =19936a(7) =179772a(8) =1800566a(9) =19867748a(10) =238718608a(11) =3105919304a(12) =43474755484a(13) =652732780048
External references
- oeis: A180073