My true love gave to me

Code:

Day    Current Presents    Presents Received    Total Presents
1        0            1            1
2        1            3            4
3        4            7            11
4        11            15            26
5        26            31            57
6        57            63            120
7        120            127            247
8        247            255            502
9        502            511            1013
10        1013            1023            2036
11        2036            2047            4083
12        4083            4095            8178

And to think I thought it was a nuisance to sing that song. What's it like to be in his shoes?