a(n) = n + max{ a(i)*a(n-i) ; 1 <= i <= n-1 }, a(n) = n for n <= 2. 1, 2, 5, 9, 15, 31, 52, 89, 164, 289, 479, 973, 1625, 2773, 5099, 8975, 15045, 30181
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