Google Spreadsheets: Alternating Background Color on Value Change?

Question

there are lots of topics about Conditional Formatting in Google Spreadsheets, but not one like what I\'m looking for.

All I want to do is set an alt

Answer 1

Easiest for me seems to be clear formatting from and select ColumnA and Format, Conditional formatting..., Format cells if... Custom formula is and:

=and(A1<>"",isodd(counta(unique($A$1:$A1)))=TRUE)

Then select formatting of choice and Done.

(From here.)