1^(2)+2^(2)+3^(2)+4^(2)+5^(2)+6^(2)+7^(2)+8^(2)+9^(2)+10^(2)+11^(2)+12^(2)+14^(2)+15^(2)+16^(2)+17^(2)+18^(2)+19^(2)+20^(2)= ?
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