Negative progression, a variation of the Martingale System.

Assumes you will win before you reach the house limit and can bankroll the losing run. Bet an initial amount (N). For each win, on the next bet N again. For each lose bet N*x+N where x is the number of losing bets. Thus if you finally win, you will recover all bet money, plus N for every loss. The progression would look like this on a $5 table. 5, 15, 35, 75, 155, 315, etc. As with all negative progressions, and this one even more so, it requires more capital and is employed to force a winning outcome following a losing streak.