Next number of the sequence 1,4,20,120

Hello

The next number of the sequence is:

1,4,(4×5),(20×6),(120×7),...
1,4,20,120,840,...

Hello
The next number of the sequence will be 840

1 x 4 =4

4 x 5 = 20

20 x 6 = 120
A chaque fois on multiplie par le chiffre d’après exemple: 4,5,6,7.....

120 x 7 = 840

(840 x 8 = 6720) just if you are wondering what is the next number