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  1. #include <stdio.h>
  2.  
  3. //a(30)の値は2496122と表示された。
  4.  
  5. int main() {
  6.     int n=30,a[31],i; 
  7.  
  8.     a[0]=2;
  9.     a[1]=-1;
  10.  
  11.     for (i=2;i<=n;i++){
  12.         a[i]=-a[i-1]+a[i-2]+2;
  13.     }
  14.  
  15.  
  16.     printf("a(30)の値は%d\n",a[30]);
  17.  
  18.     return 0;
  19. }
Success #stdin #stdout 0s 5312KB
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a(30)の値は2496122
https://ideone.com/i1jwbK
language:
C (gcc 8.3)
created:
176 days ago
visibility:
public

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