A026255 Beginning with the natural numbers, swap [ k*sqrt(3) ] and [ (k/2)*(3 + sqrt(3)) ], for all k >= 1.

2, 1, 4, 3, 7, 9, 5, 11, 6, 14, 8, 16, 18, 10, 21, 12, 23, 13, 26, 28, 15, 30, 17, 33, 35, 19, 37, 20, 40, 22, 42, 44, 24, 47, 25, 49, 27, 52, 54, 29, 56, 31, 59, 32, 61, 63, 34, 66, 36, 68, 70, 38, 73, 39, 75, 41, 78, 80, 43, 82, 45, 85, 46