A130509 a(1)=3. a(2)=1. a(3)=2. a(n+3) = 3 + a(n), for all positive integers n.

3, 1, 2, 6, 4, 5, 9, 7, 8, 12, 10, 11, 15, 13, 14, 18, 16, 17, 21, 19, 20, 24, 22, 23, 27, 25, 26, 30, 28, 29, 33, 31, 32, 36, 34, 35, 39, 37, 38, 42, 40, 41, 45, 43, 44, 48, 46, 47