Lance Stephenson, who won four city high school championships for Brooklyn’s Lincoln High at the Garden, said he was not about to go buying too many playoff tickets to yesterday’s game. He got five, and that was enough. “Tickets are very expensive and I’m not trying to waste my money,” he said with a smile. So he gave all his backers — and the Pacers — something far better. An effective game that featured 13 rebounds, an area where Indiana slaughtered the Knicks, in yesterday’s 102-95 Game 1 victory in the Eastern Conference Semifinals to temporarily at least wrest away the homecourt edge. “Coach [Frank Vogel] told me to crash and if that’s what I have to do to help the team, that’s what I’m going to do,” said Stephenson, who recorded his third straight double-figure rebound game of the playoffs — not bad for a 6-foot-5 guard. And really not bad when you consider the Pacers boast 7-2 Roy Hibbert and 6-9 David West, two exceptionally important pieces to the Pacers’ No. 1 NBA rebound ranking. “We had to get on Lance for leaking out a lot,” Hibbert said with a laugh. “He’s really physical and he likes to mix it up in there. Once the shot goes up, the big guys box out and sometimes, he steals my rebounds. But as long we we’re getting them I’m fine with it.” And they got them yesterday. The Pacers hammered the Knicks 44-30 on the glass, 11-6 in offensive rebounds. The Pacers also doubled up the Knicks in second-chance points, 20-10.