9063625

Appears in sequences

• a(n) = a(n-1) + 3*a(n-2) -2*a(n-3) - 2*a(n-4), where a(0) = 0, a(1) = 0, a(2) = 2, a(3) = 3.at n=31A295857
• Number of length n word structures with all distinct runs using exactly 3 symbols.at n=23A351643