And a partridge in a pear tree

Level pending

As the well-known song goes, on the first day of Christmas my true love gave to me a partridge in a pear tree. On the second day of Christmas, my true love gave to me 2 turtle doves and a partridge in a pear tree. On day \(n\) she gives me 1 of something, 2 of something else, ..., \(n\) of something else. At the end of the first 16 days, how many gifts has my true love given to me in total?

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