Lengths of longest uncrossed knight cycles on all sufficiently small rectangular boards m X n, with 3 <=m <= n:
......0...0...4...6...6...6...6..10
..........4...6...8..10..12..14..16
..............8..12..14..18..20..22
.................12..18..22..24..28
.....................24..26..32..36
.........................32..36..42
.............................42..50
.................................54
