Write a Python program called triglist.py to generate and display the pattern illustrated by the following examples of the program's expected input$/$output$,$ where n is a positive integer provided as input: Enter a positive integer n: $1[1]$ Enter a positive integer n: $2[1]][1,3]$ Enter a positive integer n: $3[1][1,3](1,3,6]$ Enter a positive integer n: $9[1][1,31[1,3,6]11,3,6,10][1,3,6,10,15][1,3,6,10,15,21][1,3,6,10,15,21,28][1,3,6,10,15,21,28,36][1,3,6,10,15,21,28,36,45]$