a = int(input('Please enter triangle size: '))
asciiTriangle = ''
for b in range(a):
        asciiTriangle = asciiTriangle + ' '
asciiTriangle = asciiTriangle + ' /\\\n'
centerSpacing = ''

aTemp = a
for b in range(aTemp):
        for b in range(aTemp):
                asciiTriangle = asciiTriangle + ' '

        asciiTriangle = asciiTriangle + '/'
        centerSpacing = centerSpacing + '  '
        asciiTriangle = asciiTriangle + centerSpacing + '\\\n'
        aTemp = aTemp-1

asciiTriangle = asciiTriangle + '/_'
for b in range(a):
        asciiTriangle = asciiTriangle + '__'
asciiTriangle = asciiTriangle + '_\\\n'
print (asciiTriangle)




//return

Please enter triangle size: 15
                /\
               /  \
              /    \
             /      \
            /        \
           /          \
          /            \
         /              \
        /                \
       /                  \
      /                    \
     /                      \
    /                        \
   /                          \
  /                            \
 /                              \
/________________________________\