How to remember the number of tiles to start off with in Bananagrams

The simplicity of Bananagrams is one of its strong points. But there is one rule that always seems to cause debate and searching for the instructions: The number of tiles that each player is supposed to begin with. The rules call for the following initial tile counts:

• 2-4 players - 21 tiles
  
• 5-6 players - 15 tiles
  
• more than 6 players - 11 tiles

I find it easy to remember the cutoffs for each level, probably because 4 and 6 are both even. And 21, the number of tiles when playing with 4 players, is burned into my memory. So here is my mnemonic for determining the other numbers: After the cutoff for 4 players, subtract 6 tiles. After the cutoff for 6 players, subtract 4 more tiles.

That should shave ten seconds off my next Bananagrams match. Plus now I am no longer bothered about losing my set of Bananagrams instructions.