Number of inversion sequences of length n where all consecutive subsequences i,j,k satisfy i > j < k or i < j > k.
A326308
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) =3a(5) =6a(6) =26a(7) =85a(8) =476a(9) =2171a(10) =14905a(11) =87153a(12) =708825a(13) =5053464a(14) =47514180a(15) =399542814a(16) =4264132468a(17) =41306091312a(18) =493337571005
External references
- oeis: A326308