Number of permutations in S_n avoiding 25{bar 1}34 (i.e., every occurrence of 2534 is contained in an occurrence of a 25134).
A137538
Number of permutations in S_n avoiding 25{bar 1}34 (i.e., every occurrence of 2534 is contained in an occurrence of a 25134).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =23a(5) =104a(6) =532a(7) =3004a(8) =18426a(9) =121393a(10) =851810a(11) =6325151a(12) =49448313a(13) =405298482a(14) =3470885747a(15) =30965656442a(16) =287083987270
External references
- oeis: A137538