Is there a reason why you aren't connecting the Pineapple to your laptop via the Eth port?
The IP (192.168.1.13) you are getting on your laptop suggests that you are not being assigned an IP from the Pineapple, but from your home router instead.
If the Pineapple is seeing your home router as it's default gateway, then you would need to assign the IP address of 172.16.42.42 to your home router. Have you tried setting up the Pineapple as per the instructions provided? If so, does it all work that way?
If you don't want to connect your laptop to the Pineapple via the Eth port, then you need to utilize both Wlan's. i think connecting the Pineapple to your home router via the Eth port is a hard way to do things.