Question 1153681


{{{7}}}, {{{21}}}, {{{8}}}, {{{72}}}, {{{9}}}, ?
 
pattern:

{{{7}}}, {{{(7*3)}}}, {{{8}}}, {{{(8*3^2)}}}, {{{9}}}, {{{(9*3^3)}}},...


{{{7}}}, {{{21}}}, {{{8}}}, {{{72}}}, {{{9}}}, {{{243}}}

answer: {{{243}}}