What should be the o/p

#1

what should be the o/p for n=6 and why?

#2

13 is the answer
for size 2*n grid

int fn( int n ){
    if( n == 0)
    return 0;
    if( n <= 2)
    return n;
    return fn(n-1 ) + fn(n-2);
}
#3

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