161838

Appears in sequences

• Expansion of 3*x*(1+2*x)/(1-3*x-3*x^2).at n=9A085480
• a(n) = (n^3 + n)*3^n.at n=5A121607
• Expansion of (2-3*x)/(1-3*x-3*x^2).at n=9A172012