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求指教

Exception in thread "main" java.lang.NullPointerException
 at Demo1.main(Demo1.java:14)

空指针异常???

有大神解决吗?

 public class Demo1 {
 public static void main (String[] args){
  final int NMAX=10;
  int [][]odds=new int[NMAX+1][];
  for(int n=0;n<NMAX;n++)
   odds[n]=new int[n+1];
  
  for (int n=0;n<odds.length;n++)
   for(int k=0; k<odds[n].length;k++){
    //空指针异常
    int lotteryOdds=1;
    for(int i=1;i<=k;i++)
     lotteryOdds=lotteryOdds*(n-i+1)/i;
    odds[n][k]=lotteryOdds;
   }
  for(int [] row:odds)
  {
   for (int odd:row)
    System.out.printf("%4d",odd);
   System.out.println();
  }
 }

}

求指教