Number of sequences with n copies each of 1,2,3,4 avoiding the pattern 1234.
A269122
Number of sequences with n copies each of 1,2,3,4 avoiding the pattern 1234.
Terms
- a(0) =1a(1) =23a(2) =1879a(3) =173891a(4) =16140983a(5) =1474050783a(6) =132279480115
External references
- oeis: A269122