581130732

Appears in sequences

• a(n) = (3^n - 3)/2.at n=18A029858
• a(n) = 3*(a(n-2) + 1), with a(0) = 1, a(1) = 3.at n=35A087503
• a(n) = 6 * A015518(n).at n=18A120471
• a(0) = 1, a(1) = 3, a(n) = 3*a(n-1) + 3 for n > 1.at n=18A123109
• a(n) = 3*A132357(n).at n=17A135264
• Numbers n such that 9^10 + n^2 is a square.at n=9A180973