21523362

Appears in sequences

• Number of vertices in Sierpiński triangle of order n.at n=15A067771
• a(0) = 2, a(n) = 3*a(n-1) - 3.at n=16A115098
• a(n) = 6 * A015518(n).at n=15A120471
• a(n) = 3*A132357(n).at n=14A135264