'''
# Read input from stdin and provide input before running code

name = raw_input('What is your name?\n')
print 'Hi, %s.' % name
'''
#print 'Hello World!'
t=input()
while t>0:
	t-=1
	n=input()
	if n==1:
		print"1"
	else:
		print n**3-(n-2)**3