12 Days of Christmas math

Have you ever wondered about those gifts from the song “The 12 Days of Christmas”? And since the lines repeat, does that mean that on Day 1, the True Love gave a Partridge in a Pear Tree, and on Day 2, gave Two Turtle Doves and yet another Partridge in a Pear Tree, etc, etc, ad infinitum on down the line? We calculated out the totals...