a(n) = A078822(n) - 1. 0, 0, 2, 1, 3, 3, 4, 2, 4, 4, 4, 5, 6, 6, 6, 3, 5, 5, 5, 6, 6, 5, 7, 7, 8, 8, 8, 8, 9, 9, 8, 4, 6, 6
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