static int nthTerm ( int N ) {
  int nth = 0 , first_term = 4 ;
  int pi = 1 , po = 1 ;
  int n = N ;
  while ( n > 1 ) {
    pi *= n - 1 ;
    n -- ;
    po *= 2 ;
  }
  nth = ( first_term * pi ) / po ;
  return nth ;
}

static int nthTerm ( int N ) { int nth = 0 , first_term = 4 ; int pi = 1 , po = 1 ; int n = N ; while ( n > 1 ) { pi *= n - 1 ; n -- ; po *= 2 ; } nth = ( first_term * pi ) / po ; return nth ; }
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