t(n) = (5n4 - 10n3 + 55n2 - 50n + 24)/24 where n = 1, 2, 3, ...
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A single transformation does not provide enough information to determine a rule.
7X18=126 because 7x10=70 Then 7x8=56 126
Each number is decreasing by half.
The LCM of 21 and 56 is 168.
LCM(21, 49, 56) = 1176