Java Programming

I was hoping to get input on how to approach the storage of a large multidimensional array. I am doing independent study and statistical analysis on various topics and think I might need a separate database to hold the data that can be accessed through a JAVA driven GUI.

Although the sizes vary, the structure would be nearly the same. For example, there might be 10 main parent elements. Each of those 10 elements would have 10 of thier own sibling subelements. From there, it would continue through maybe 50 iterations ending with 10^50 leaves alone. In the most extreme cases, there might be a total of 10^54 elements in this tree structure. The values of these elements would be static. What possible solutions are out there for maintaining something of this size?

Using this example, the end goal is to be able to start at one of the first 10 parent elements and traverse down to one of the 10 elements under it until the end is reached. This would be done through a GUI where user input would determine which of the 10 elements to go to, then return what is contained there.

Any help on how, why and where to hold that much data would be greatly appreciated.