static long evenFib ( int n ) {
  if ( n < 1 ) return n ;
  if ( n == 1 ) return 2 ;
  return ( ( 4 * evenFib ( n - 1 ) ) + evenFib ( n - 2 ) ) ;
}

static long evenFib ( int n ) { if ( n < 1 ) return n ; if ( n == 1 ) return 2 ; return ( ( 4 * evenFib ( n - 1 ) ) + evenFib ( n - 2 ) ) ; }
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