A274617 Fourth column of A269526.
6, 1, 2, 5, 4, 7, 3, 9, 10, 11, 12, 8, 14, 13, 16, 17, 18, 19, 15, 21, 20, 23, 22, 25, 26, 27, 28, 24, 30, 29, 32, 33, 34, 35, 31, 37, 36, 39, 38, 41, 42, 43, 44, 40, 46, 45, 48, 49, 50, 51, 47, 53, 52, 55, 54, 57, 58, 59, 60, 56, 62, 61, 64, 65, 66, 67, 63, 69, 68, 71, 70, 73, 74, 75, 76, 72, 78, 77, 80
Offset: 1