Reproducing Rabbits...

Similar to the aliens one that made you say "yuck" I found this one.

Rik’s Dad gave him 2 Rabbits, which he named Aled and Pam. Pam just had 8 babies — 4 males and 4 females!

"Ten rabbits aren’t so many," said Rik to his Dad. "And they’re cute."

"Yes,” said his mother, "but these cute baby rabbits can breed when they are 6 weeks old. The babies are born after 3 weeks of pregnancy."

If each female rabbit has only 1 litter and all the litters have 8 babies, half males and half females, how many mice will Rik have in 18 weeks?