Number of sequences with 4 copies each of 1,2,...,n avoiding the pattern 12...n.
A269114
Number of sequences with 4 copies each of 1,2,...,n avoiding the pattern 12...n.
Terms
- a(0) =0a(1) =0a(2) =1a(3) =3199a(4) =16140983a(5) =142951955371
External references
- oeis: A269114