Megilin's Profile

You could get a swivel-style tv mount. Mount it to one of the wall sides, then swivel it around to face the seating. It may not look great from the back, but it would point the tv in the right direction.

here are some amazon examples: http://www.amazon.com/Swivel-TV-Mount/lm/R15QADM8CASWN3

I have one that slides side-to-side, but doesn't swivel.