static int sumOfSeries ( int n ) {
  return n * ( n + 1 ) * ( 6 * n * n * n + 9 * n * n + n - 1 ) / 30 ;
}

static int sumOfSeries ( int n ) { return n * ( n + 1 ) * ( 6 * n * n * n + 9 * n * n + n - 1 ) / 30 ; }
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