1 2 3 4 5 6 7 8 9 10
10 FOR F=0 TO 7 20 OUT 0,2^F 30 GOSUB 100 40 NEXT F 50 FOR F=7 TO 0 STEP -1 60 OUT 0,2^F 70 GOSUB 100 80 NEXT F 90 GOTO 10 100 FOR X = 1 TO 150 : NEXT X : RETURN