Write an expression that outputs a vector with the entries

$1$;

$1$

$2$

;

$1$

$4$

;

$1$

$8$

;

$1$

$16$

; : : : ;

$1$

$1024$

without typing out all these numbers $($you do not need to write a for loop!$).$

Your $.$m le should contain a single expression in a single line.