Effective atomic number of transition metal in potassium ferrocyanide

Formula of potassium ferrocyanide is ${\mathrm{K}}_4\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right].$.

Formula of EAN is:

$\mathrm{EAN}=\mathrm{X}+2\left(\mathrm{Y}\right)-\mathrm{Z}$

X= Atomic number of metal

Y=Coordination compound

Z=Oxidation number of the metal ion

$$\begin{gathered} \mathrm{EAN}=\mathrm{X}+2\left(\mathrm{Y}\right)-\mathrm{Z} \\ \mathrm{EAN}=26+2\left(6\right)-2 \\ \mathrm{EAN}=36 \end{gathered}$$