If you mean the sum of the squares of natural numbers such as:
1^2+2^2+3^2+4^2+5^2.........=1/6 n( n + 1 )( 2 n + 1 ).
+118653 In statistics the sum of the squares means
find the mean, \(\bar{x}\)
find the distance of each data point from the mean and square the answers .
\( (x-\bar{x})^2 \qquad or \qquad (\bar{x}-x)^2 \qquad \text{they are the same}\\ \text{Now add them all together}\\ \sum (x-\bar{x})^2\)
