A018841 Number of steps for {2,3} fairy knight to reach (n,n) on infinite chess-board.

0, 2, 4, 6, 4, 2, 4, 6, 6, 6, 4, 6, 6, 6, 8, 6, 8, 8, 8, 10, 8, 10, 10, 10, 12, 10, 12, 12, 12, 14, 12, 14, 14, 14, 16, 14, 16, 16, 16, 18, 16, 18, 18, 18, 20, 18, 20, 20, 20, 22, 20, 22, 22, 22, 24, 22, 24, 24, 24, 26, 24, 26, 26, 26, 28, 26, 28, 28, 28, 30, 28, 30, 30, 30, 32, 30, 32, 32