* Lunda-animal* is a Lunda 5-omino with one unit square
at one of its ends representing a head. A Lunda-animal walks in such
a way that after each step the head occupies a new unit square, and
each other cell occupies the preceeding one. In other words, two
subsequent positions of a Lunda-animal have a Lunda-tetromino in
common.

How many different positions *p _{5}*(

P.Gerdes proved that:

for

It is interesting that for every Lunda