Answer:
354294
Explanation:
a₁ = 6 = 6 * (-3)⁰
a₂ = -18 = 6 * (-3)¹
a₃ = 54 = -18 * (-3) = 6 * (-3)²
a₁₁ = 6 * (-3)¹⁰ = 354294
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