Text this: Upper bound for the crossing number of Q<inf>n</inf>×K<inf>3</inf>

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 ______     ______              _____      _____  
|      \\  /_   _//   ____     |  ___||   / ___// 
|  --  //   -| ||-   |    \\   | ||__     \___ \\ 
|  --  \\   _| ||_   | [] ||   | ||__     /    // 
|______//  /_____//  |  __//   |_____||  /____//  
`------`   `-----`   |_|`-`    `-----`  `-----`   
                     `-`