KöMaL 2010 K238

The centre of the regular pentagon ABCDE is the point $O$. Each of the points $A$, $B$, $C$, $D$, $E$, $O$ is coloured red, yellow, blue or green (each point is given a single colour), so that none of the triangles OAB , OBC , OCD , ODE , OEA has two vertices of the same colour. In how many different ways is that possible?