Calculates the maximum number of entries which can be supported by a POD
with a given Merkle tree depth. Since names and values are separate leaves
of the tree, the formula is 2**(merkleDepth-1)
Parameters
merkleDepth: number
the depth of a POD Merkle tree
Returns number
the maximum number of entries of any POD with the given depth
Calculates the maximum number of entries which can be supported by a POD with a given Merkle tree depth. Since names and values are separate leaves of the tree, the formula is 2**(merkleDepth-1)