174436

Appears in sequences

• Number of periodic palindromic structures of length n using exactly three different symbols.at n=23A056509
• a(n) = n*(94 + 5*n + 25*n^2 - 5*n^3 + n^4)/120.at n=30A057703
• a(n) = Sum_{k=0..floor(n/3)} binomial(3*n-3*k+1,n-3*k).at n=7A390703