Question: i know the green answer is correct but i just need to see the work so i can understand more How is this sum expressed

i know the green answer is correct but i just need to see the work so i can understand more

How is this sum expressed in sigma notation? 64 + 16 + +1+4 5 1+3 (41 -4 ) IM IM IM. I'M (4-i+2)
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