Number of inversion sequences of length n where all consecutive subsequences i,j,k satisfy i > j <= k or i <= j > k.
A328491
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) =1a(4) =4a(5) =6a(6) =32a(7) =89a(8) =592a(9) =2402a(10) =19072a(11) =101866a(12) =939136a(13) =6221228a(14) =65291264a(15) =516212409a(16) =6075261184a(17) =55812055946a(18) =727912302592
External references
- oeis: A328491