Thanks @cdunagan051 for providing the list. Years since last national championship.
1 Year - Ohio State
2 Years - Florida St
3 Years - Alabama
5 Years - Auburn
7 Years - Florida
8 Years - LSU
10 Years - Texas
11 Years - USC
14 Years - Miami
15 Years - Oklahoma
17 Years - Tennessee
18 Years - Michigan, Nebraska
25 Years - Colorado, Georgia Tech
27 Years - Notre Dame
29 Years - Penn St
31 Years - BYU
34 Years - Clemson
35 Years - Georgia
39 Years - Pitt
49 Years - Michigan State
51 Years - Arkansas
55 Years - Ole Miss
56 Years - Syracuse
61 Years - UCLA
62 Years - Maryland
69 Years - Army
74 Years - Minnesota
76 Years - Texas A&M
1 Year - Ohio State
2 Years - Florida St
3 Years - Alabama
5 Years - Auburn
7 Years - Florida
8 Years - LSU
10 Years - Texas
11 Years - USC
14 Years - Miami
15 Years - Oklahoma
17 Years - Tennessee
18 Years - Michigan, Nebraska
25 Years - Colorado, Georgia Tech
27 Years - Notre Dame
29 Years - Penn St
31 Years - BYU
34 Years - Clemson
35 Years - Georgia
39 Years - Pitt
49 Years - Michigan State
51 Years - Arkansas
55 Years - Ole Miss
56 Years - Syracuse
61 Years - UCLA
62 Years - Maryland
69 Years - Army
74 Years - Minnesota
76 Years - Texas A&M