The first three terms are .1, .2, .3
To get the 4th term we add those 3 terms and get 1.+.2+.3 = .6
To get the 5th term we add the preceding three terms: .2+.3+.6 = 1.1
To get the 6th term we add the preceding three terms: .3+.6+1.1 = 2.0

That's the pattern.  You finish.

Edwin