I understand that a quadratic sequence is a sequence where the difference between the terms is an arithmetic sequence, but what is it called when the difference between those terms is a geometric sequence? Is it then still a quadratic?
Example: 3, 12, 48, 192, ...
The differences are: 9, 36, 144, ...
The latter is a geometric sequence increasing by a factor of 4, but what is the first sequence then, from which the latter is derived?
