#Mathematica 59 bytes

Column@FromCharacterCode[#@#@26+64]&[#-Abs@Range[1-#,#-1]&]

Mathematica 59 bytes

Column@FromCharacterCode[#@#@26+64]&[#-Abs@Range[1-#,#-1]&]

#Mathematica 59 bytes

Column@FromCharacterCode[#@#@26+64]&[#-Abs@Range[1-#,#-1]&]

Try it here

#Mathematica 59 bytes

Column@FromCharacterCode[#@#@26+64]&[#-Abs@Range[1-#,#-1]&]

#Mathematica 59 bytes

Column@FromCharacterCode[#@#@26+64]&[#-Abs@Range[1-#,#-1]&]

Try it on http://mmascript.com/kernel?q=Column%40FromCharacterCode%5B%23%40%23%4026%2B64%5D%26%5B%23-Abs%40Range%5B1-%23%2C%23-1%5D%26%5D

#Mathematica 59 bytes

Column@FromCharacterCode[#@#@26+64]&[#-Abs@Range[1-#,#-1]&]

Try it here