Table 15 The percentage \(\rho _{\text {2bt}}(\delta )\) of the number of acyclic chemical graphs in \(\text {DB}^{(\le 50)}\) such that the degree of the root of the 2-branch-tree is \(\delta \in [1,4]\) to the number of all acyclic chemical graphs in \(\text {DB}^{(\le 50)}\)
\(\rho _{\text {2bt}}(1)\) | \(\rho _{\text {2bt}}(2)\) | \(\rho _{\text {2bt}}(3)\) | \(\rho _{\text {2bt}}(4)\) |
|---|---|---|---|
\(6.39\%\) | \( 83.58\%\) | \( 9.30\%\) | \( 0.73\%\) |