Number of inversion sequences of length n where all consecutive subsequences i,j,k satisfy i > j < k or i <= j >= k.
A328409
Number of inversion sequences of length n where all consecutive subsequences i,j,k satisfy i > j < k or i <= j >= k.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =6a(5) =16a(6) =57a(7) =245a(8) =1248a(9) =7151a(10) =46104a(11) =325560a(12) =2523437a(13) =21106494a(14) =190806861a(15) =1842347541a(16) =19018910502a(17) =208088481921
External references
- oeis: A328409