$h_i$

$\left|V_{h_i}\right|$

$\tilde{M}\left(\Delta ,k\right)$

0

1

1

1

$\Delta -2$

$\Delta -1$

2

$\left(\Delta -2\right)\left(\Delta -1\right)$

${\left(\Delta -1\right)}^2$

3

$\left(\Delta -2\right){\left(\Delta -1\right)}^2$

${\left(\Delta -1\right)}^3$

$\cdots$

$\cdots$

$\cdots$

k

$\left(\Delta -2\right){\left(\Delta -1\right)}^{k-1}$

${\left(\Delta -1\right)}^k$