That is where you take the number of cards and multiply up. We have 52 different cards in a deck, so that would be 1x2x3x4x5x6x7x9.....and you keep going until you hit 52. According to McGill ...

Founded in 1889, Nintendo originally produced Hanafuda--a type of card used to play a variety of games dating back to the 16th century. Playing cards are obviously no longer Nintendo’s main ...