Number of inversion sequences of length n where all consecutive subsequences i,j,k satisfy i < j > k or i >= j <= k.
A328425
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) =4a(4) =11a(5) =36a(6) =142a(7) =647a(8) =3383a(9) =19816a(10) =129162a(11) =923279a(12) =7201951a(13) =60720996a(14) =551268926a(15) =5352973967a(16) =55430433719a(17) =609033864160
External references
- oeis: A328425