It's a sequence- 1x1=1, 2x2=4, 3x3=9, 4x4=16, 5x5=25, 6x6=36, 7x7=49,,,,,,,,,,,
1,4,9,16,25,36,49,,,,,,,,,,,
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So you're adding 3, 5, 7, 9, 11 etc 1, 4, 9, 16, 25, 36, 49
the next number in the sequence is 25............starting at the beginning, you add the odd numbers to the existing number to get the answer. Add "1" to 0, get 1; add "3" to 1, get 4; add "5" to 4, get 9; add "7" to 9 to get 16........and add "9" to 16 to get 25.........
n2
This is a sequence of perfect squares. 12=1, 22=4, 32=9, 42=16, 52=25. The next number is 62=36.
These look like a series of squares.1 squared is 1, 2 squared is 4, 3 squared is 9, 4 squared is 16, 5 squared is 25 and then 6 squared is........36.