Pyramid

Let us write the numbers from $1$ to $N$ in a row (for example, if N = 4):

$1234$

Below this row, write another row of (N - 1) numbers, where each number is the product of the two numbers directly above it:

$1234$

$2612$

Continue this process, writing new rows, each time decreasing the length by one, until only one number remains:

$1234$

$2612$

$1272$

$864$

In this way, we obtain an inverted pyramid, with $864$ at the vertex.