and actually it is much less then 48
My count of D1 teams who have never been to the tournament:
America East (4): Hartford, Maine, New Hampshire, UMass-Lowell
Atlantic Sun (5): Kennesaw State, Lipscomb, NJIT, USC Upstate, Stetson
Big Sky (2): North Dakota, Sacramento State
Big South (4): Gardner-Webb, High Point, Longwood, Presbyterian
Big Ten (1): Northwestern
Big West (2): UC Davis, UC Riverside
CAA (2): Elon, William & Mary
Horizon (2): Northern Kentucky, Youngstown State
MAAC (1): Quinnipiac
MEAC (3): Bethune-Cookman, MD-Eastern Shore, Savannah State
NEC (3): Bryant, Sacred Heart, St. Francis (NY)
OVC (3): Jacksonville State, SIU-Edwardsville, Tennessee-Martin
Patriot (1): Army
Southern (1): The Citadel
Southland (3): Abilene Christian, Central Arkansas, Incarnate Word
SWAC (1): Grambling State
Summit (5): Denver, IPFW, Nebraska-Omaha, South Dakota, Western Illinois
WAC (5): Chicago State, Grand Canyon, UMKC, Texas-Rio Grande Valley, Utah Valley
That's 48. Did I miss any?