With
A1:A10 containing this list, with A1 as the heading:
OrigList
Alpha
Alpha
Alpha
Bravo
Charlie
Charlie
Delta
Delta
Delta
and
B1: SeqList
If the list will not contain any all-numeric entries, this formula begins listing
each unique name, as it is encountered
B2: =LOOKUP(CHAR(255),CHOOSE({1,2},"",INDEX($A$2:$A$20,MATCH(0,
IF($A$2:$A$20<>"",INDEX(COUNTIF($B$1:B1,$A$2:$A$20),0)),0))))
Copy that formula down as far as you need.
(If the list will include numeric entries, there's longer formula to use)
In the above example, the following values are returned by the formulas
in B2:B5
Alpha
Bravo
Charlie
Delta
Does that help?
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