860934420

Appears in sequences

• a(n) = n*3^(n-4).at n=17A006234
• a(n) = 3*a(n-1), with a(1) = 20.at n=16A116530
• a(n) = (n/4)*3^(n/2)*((1+sqrt(3))^2+(-1)^n*(1-sqrt(3))^2).at n=30A187273
• Expansion of (1+3*x)^2/(1-3*x)^2.at n=15A236967