SAS SEQ+1 in Teradata

Question

I am converting following code in SAS to Teradata

DATA T_SEQ;
SET Macro_SEQ;
SEQ+1;
by Sec_key;
IF FIRST.Sec_key then SEQ=1;

My teradata script is

select *, Row_Number() over (partition by Sec_key Order by SEC_key) as SEQ
from T_SEQ

Problem is teradata script is not giving me the same ouput like SAS Script and I am getting different sequence number in teradata output as compare to SAS Script.

Basically I need this type of SEQ
---------  -------------------- ---------------  
Australia            1421810.92    1  
Canada               2604540.71    1  
Canada               1453719.46    2  
Central              3189418.36    1  
France               3121616.32    1