0, 0; 1, 2; 2, 4; 3, 6; 4, 8; 5, 10; 6, 12; 7, 14; 8, 16; 9, 18; 10, 20; 11, 22; 12, 24; 13, 26; 14, 28; 15, 30; 16, 32;