Odd position are Fibonacci and Even position are Factorial in series :
#include <stdio.h>
int main()
{
int a[30],i,n,d=0,b=1,f=1,c,j;
scanf("%d",&n);
i=0;
while(c<=n)
{
c=d+b;
a[i]=c;
d=b;
b=c;i=i+2;
}
i=1;
for(j=1;j<=n;j++)
{
f=f*j;
a[i]=f;
i=i+2;
}
for(i=0;i<(n+n);i++)
printf("%d ",a[i]);
return 0;
}
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