Number of sequences with 3 copies each of 1,2,...,n avoiding the pattern 12...n.
A269113
Number of sequences with 3 copies each of 1,2,...,n avoiding the pattern 12...n.
Terms
- a(0) =0a(1) =0a(2) =1a(3) =374a(4) =173891a(5) =117392909a(6) =117108036719
External references
- oeis: A269113