Create a graph from the tree structure of an expression
ExpressionGraph[expr]
ExpressionGraph[expr, n]
ExpressionGraph[expr, n, form]
ExpressionGraph[Nest[{#, #}&, x, 4]]
→ Graph[<31>, <30>]ExpressionGraph[a + b ^ 2 + c ^ 3 + d]
→ Graph[<9>, <8>]ExpressionGraph[Nest[{{#}, #, #}&, x, 4]]
→ Graph[<161>, <160>]- FormatType — default StandardForm