a(n) = 2*n-a(n-1)+1 with n>1, a(1)=5. 5, 0, 7, 2, 9, 4, 11, 6, 13, 8, 15, 10, 17, 12, 19, 14, 21, 16, 23, 18, 25, 20, 27, 22, 29
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