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a_formula

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Conjecture: a(n) = 3^n + 3 * 2^n + 6 for n ≥ 1.

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Lean 4 Statement 
theorem a_formula {n : ℕ} (hn : n ≥ 1) : a n = 3 ^ n + 3 * 2 ^ n + 6
ID: OEIS__87719__a_formula
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