Number of words on {1,1,2,2,3,3,...,n,n} avoiding the pattern 12345.
A266735
Number of words on {1,1,2,2,3,3,...,n,n} avoiding the pattern 12345.
Terms
- a(0) =1a(1) =1a(2) =6a(3) =90a(4) =2520a(5) =102011a(6) =5176504a(7) =307027744a(8) =20472135280
External references
- oeis: A266735