Puzzle | Program to find number of squares in a chessboard | Function to return count of squares ; ; A better way to write n * ( n + 1 ) * ( 2 n + 1 ) / 6 ; Driver Code
function countSquares ( n ) { return ( n * ( n + 1 ) / 2 ) * ( 2 * n + 1 ) / 3 ; } let n = 4 ; document . write ( " " + countSquares ( n ) ) ;