#include <stdio.h>

int main()
{
    /* last two members of the
       sequence: */
    int a, b;
    int i;
    /* number of sequence members
       to produce: */
    int N = 21;

    a = b = 1;

    for( i = 1; i <= N; i++ ) {
        int t = b;
        b += a;
        printf( "%d\t%d\n", i, b );                                                                                                                                                 
        a = t;
    }

    return 0;
}