The number of permutations avoiding simultaneously consecutive patterns 213 and 231.
A173940
The number of permutations avoiding simultaneously consecutive patterns 213 and 231.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =10a(5) =30a(6) =108a(7) =454a(8) =2186a(9) =11840a(10) =71254a(11) =471620a(12) =3405444a(13) =26638846a(14) =224412432a(15) =2025537526a(16) =19501264282a(17) =199486609542
External references
- oeis: A173940