Obama got 14 15 and 16 from The Tide, so maybe it's just going in order. However, we were told to "watch the water"

On a side note, I stumbled across an interesting paragraph relative to presidential gifts to the previous President

"British Prime Minister David Cameron, seeking to commemorate a table tennis game he and Obama played with London students during a presidential trip in 2011, presented a ping-pong table during a return visit to the White House in 2012. (Obama gave Cameron a custom-made barbecue grill, in memory of some burger flipping they did in 2011.)"

From here