def geneYHtri(max): n,a,b=0,[],[1]

while n < max:
    yield b
    x=0
    a,b=b[:],[1,1]

    while x<len(a)-1:
        b.insert(-1,(a[x]+a[x+1]))
        x=x+1
    n=n+1
return 'Done'

for i in (geneYHtri(15)): print(i)