A072756 a(n)=least positive integer not a(k)+Floor(a(k)/2) for k<n.

0, 1, 2, 4, 5, 8, 9, 10, 11, 14, 17, 18, 19, 20, 22, 23, 24, 26, 29, 31, 32, 35, 37, 38, 40, 41, 42, 44, 45, 47, 49, 50, 51, 53, 54, 56, 58, 59, 62, 64, 65, 68, 69, 71, 72, 74, 77, 78, 80, 82, 83, 85, 86, 89, 90, 91, 92, 94, 95, 98, 99, 100, 101, 104, 105, 107, 109, 110