I'm trying to create a binomial tree. It should look like

so that the rightmost edge is vertical.
The code, which I have is
Code: Select all
\begin{tikzpicture}[every tree node/.style={draw,circle},
level distance=1.25cm,sibling distance=.5cm,
edge from parent path={(\tikzparentnode) -- (\tikzchildnode)}]
\Tree [.\node[red] { };
[.{ }
[.{ }
[.{ } [.{ } ]
] [.{ } ]
]
[.{ } [.{ } ]
]
[.{ } ]
]
[.{ }
[.{ } [.{ } ]
] [.{ } ]
]
[.{ }
[.{ } ]
]
[.{ } ]
]
\end{tikzpicture}
THX