Number of inversion sequences of length n where all consecutive subsequences i,j,k satisfy i >= j <= k or i <= j >= k.
A326412
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) =5a(4) =17a(5) =69a(6) =330a(7) =1797a(8) =11028a(9) =74932a(10) =559351a(11) =4540088a(12) =39840318a(13) =375421225a(14) =3782383945a(15) =40548234374a(16) =460956742449
External references
- oeis: A326412