I have labels in column A - 1.1, 1.2, 1.3 ... 2.1, 2.2....5.1, etc.

Instead of the A2=A1+.11, is there an alternate formula that will allow for
entering a new row in the middle of a sequence and having the subsequent
entries renumber correctly? When I insert a new line in the middle (e.g.,
between A4 and A5) I get a blank A5 and now A6 shows A4+.1 and not the
desired A5+.1. I'm happy to manually enter A4+.1 into the new A5.

I know I could probably just redrag the autofill, but it becomes tedious and
I've got to think someone smarter than me can figure this out =)