Sequence demo

def sequence_1():
    th = []
    for i in range(10):
        th.append(i)
        print i+sum(th)

def sequence_2():
    a = lambda n: (((n-1)*(n+2))/2)
    for i in range(1, 11):
        print a(i)

#print the same things

sequence_1()
sequence_2()