Text this: On Pythagorean triples and triangular square numbers

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