2*a(n) = A108618(n) + 3*A108619(n). 2, 4, 4, 2, 0, 3, 6, 4, 2, 6, 6, 2, 5, 10, 6, 4, 10, 8, 0, 9, 12, 4, 11, 20, 12, 6
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