a(n) = 3*n-a(n-1)+1 with n>1, a(1)=5. 5, 2, 8, 5, 11, 8, 14, 11, 17, 14, 20, 17, 23, 20, 26, 23, 29, 26, 32, 29, 35, 32, 38, 35
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