freebitco.in has manipulated patterns, so never use the same method multiple times. This site has millions of algorithms that may give you a simple pattern multiple times to fool you and you repeat the same thing until you win, but then it acts exactly the opposite of your behavior to lose.
No, there is no pattern.
I am not a fan of freebitco, but their game is provably fair, the numbers are determined completely randomly and you can verify them every time you play their multiplier game.
Take note that in freebitco and every other casino, there's a house edge which guarantees that you will lose in the long run and it may worth mentioning that the house edge in freebitco is 5% which is higher than any other casino I know.