5230206126

Appears in sequences

• Bending a piece of wire of length n+1 (configurations that can only be brought into coincidence by turning the figure over are counted as different).at n=21A001444
• a(n) = 3^n*(3^(n+1)+1)/2.at n=10A051407
• a(n) = n! * Sum_{i+2j+3k=n} 1/(i!*(2j)!*(3k)!).at n=22A094717