This is a Fibonacci sequence where the first two terms are known as 'seed values' and successive terms are the sum of the two previous terms.
4 = 3 + 1
7 = 4 + 3
11 = 7 + 4
18 = 11 + 7.
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Add 3 each time
1+3=4 3+4=7 4+7=11 7+11=18 11+18=29 18+29=47
(11/18) - (1/6) = (11/18) - (3/18) = (11-3)/18 = 8/18 = 4/9
11/18 - 1/6 = 11/18 - 3/18 = 8/18 = 4/9
19 + 3 = 22 to repeat the pattern