5230176603

Appears in sequences

• Number of vertices in Sierpiński triangle of order n.at n=20A067771
• a(n) = 3*a(n-1) + a(n-2) - 3*a(n-3).at n=21A103425
• a(0) = 2, a(n) = 3*a(n-1) - 3.at n=21A115098
• a(n) = (3/2)*(1+(-3)^(n-1)).at n=21A165553