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  1. #include <stdio.h>
  2.  
  3. /* 再帰で a_n を求める関数 */
  4. int a(int n)
  5. {
  6.     /* 終了条件 */
  7.     if(n == 0)
  8.         return 0;
  9.  
  10.     /* 再帰呼び出し */
  11.     return a(n - 1) * a(n - 1) + 1;
  12. }
  13.  
  14. int main(void)
  15. {
  16.     int i;
  17.  
  18.     for(i = 1; i <= 6; i++) {
  19.         printf("a_%d = %lld\n", i, a(i));
  20.     }
  21.  
  22.     return 0;
  23. }
Success #stdin #stdout 0.01s 5288KB
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stdin
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Standard input is empty
stdout
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a_1 = 1
a_2 = 2
a_3 = 5
a_4 = 26
a_5 = 677
a_6 = 458330
https://ideone.com/ffh5j8
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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