I suppose that you have to continue the sequence (i.e., understand the rule it is formed).
Also I suppose that the numbers at left are the numbers of the sequence terms.
Then consider (a_n)/n:6/2 = 312/3 = 420/4 = 530/5 = 642/6 = 7...
probably you see the pattern.
So (a_n)/n = n+1 and a_9 = 9*(9+1) = 90.
The answer: 90.
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