1 - 2 - 4 - 8 - 16 - 32 - 64 the sequence doubles
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every next term is 4 smaller than previous so 7th term = -23
You mean what IS a geometric sequence? It's when the ratio of the terms is constant, meaning: 1, 2, 4, 8, 16... The ratio of one term to the term directly following it is always 1:2, or .5. So like, instead of an arithmetic sequence, where you're adding a specific amount each time, in a geometric sequence, you're multiplying by that term.
They are 1/2 the previous term and so the next term will be -32
If the first two numbers are 0, 1 or -1 (not both zero) then you get an alternating Fibonacci sequence.