Contribute cover: Large & Small numbers & Sequences

  _  __    ______    ______     ___    
 | |/ //  /_   _//  /_   _//   / _ \\  
 | ' //    -| ||-   `-| |,-   / //\ \\ 
 | . \\    _| ||_     | ||   |  ___  ||
 |_|\_\\  /_____//    |_||   |_||  |_||
 `-` --`  `-----`     `-`'   `-`   `-`