(4) Finding an Explicit Formula Set up a column for n and a column for an. Look for a pattern between the input and the output. Example 4: Write an explicit formula for each sequence. a) {0,In 2,In 3,In 4, ...} 111 1 b) 1/2'4'8'16' c) {1, 3,5,7,... } d) 14' 9' 16