What is the next 4 numbers in the sequence

What is the next 4 numbers in the sequence 1, 4, 9, 16, 25, 36, 49, 64, 81 and what is the pattern ?
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Answer:
The next four numbers are 100, 121, 144, 169.
The pattern is adding sequential odd numbers:
1 + 3 = 4
4 + 5 = 9
9 + 7
16 + 9 etc etc …

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