Array formula in A4:

=TEXT(DATE(2009, IF(COLUMN(A:A)=1, 1, COLUMN(A:A)*3-2),  1),  "MM/DD/YY")&"-"&TEXT(DATE(2009, COLUMN(A:A)*3+1,  1)-1,  "MM/DD/YY") + ENTER copied right as far as necessary.

Array formula in A7:

=TEXT(DATE(2009, IF(COLUMN(A:A)=1, 1, 1-(COLUMN(A:A)-1)*3),  1),  "MM/DD/YY")&"-"&TEXT(DATE(2009, IF(COLUMN(A:A)=1, 4, 0-(COLUMN(A:A)-2)*3+1),  1)-1,  "MM/DD/YY") + ENTER copied right as far as necessary.

Array formula in A10:

=TEXT(DATE(2009, IF(ROW(1:1)=1, 1, ROW(1:1)*3-2),  1),  "MM/DD/YY")&"-"&TEXT(DATE(2009, ROW(1:1)*3+1,  1)-1,  "MM/DD/YY") + ENTER copied down as far as necessary.

Array formula in A17:

=TEXT(DATE(2009, IF(ROW(1:1)=1, 1, 1-(ROW(1:1)-1)*3),  1),  "MM/DD/YY")&"-"&TEXT(DATE(2009, IF(ROW(1:1)=1, 4, 0-(ROW(1:1)-2)*3+1),  1)-1,  "MM/DD/YY") + ENTER copied down as far as necessary.

Functions in this article:

ROW(reference) returns the rownumber of a reference

DATE(year,month,day) returns the number that represents the date in Microsoft Office Excel date-time code

TEXT(value, format_text)
Converts a value to text in a specific number format

IF(logical_test;[value_if:true];[value_if_false])
Checks whether a condition is met, and returns one value if TRUE, and another value if FALSE

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