It is: 1
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This is the series of square numbers, (16= 4*4). The next number is 5*5=25.
These is the list of squares. 6^2=36 is the next number
16' then 25 and then 36 et.seq. The clue is 0,1,4,9,16,25,36, ... = 0^(2) , 1(2) , 2^(2), 3^(2) , 4^(2) , 5^(2) , 6^(2), ... n^(2) ...
36
25, 36, 49 . . . these are the squared numbers