1569750

Appears in sequences

• a(n) = 3^n - 3*2^n + 3.at n=13A001117
• Number of primitive (aperiodic) words of length n which contain exactly three different symbols.at n=12A056268
• Number of palindromes of length n using exactly three different symbols.at n=24A056454
• Number of palindromes of length n using exactly three different symbols.at n=25A056454
• Number of periodic palindromes using exactly three different symbols.at n=24A056489
• A(k,3) where A(k,n) = Sum_{m=1..k} (-1)^(m+1) *binomial(n,m)*m^k.at n=12A179483