It could be a sequence generated by the rule:
Un = (45n4 - 470n3 + 1731n2 - 2554n + 1296)/24 for n = 1, 2, 3, ...
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5.4444
1, 2, 3, 6, 9, 18 1, 7, 49
The fraction 9/49 can simplified. The simplest form of 9/49 equals to 3/7.
10
(3 root 7) squared = (3 root 7) (3 root 7) = (3x 3) ( sq root 7 x 7) = 9 x sq root 49 = 9 x 7 = 63