How did Fibonacci invent the Fibonacci numbers?

He was not the first to discover it. Fibonacci lived around 1200 AD. He might have discovered it independently but it was known in India from 200 BC.

The 960th Fibonacci number is already larger than (1 googol)2 , so a precise, unrounded answer to your question would have more than 10200 digits in it, and you're not going to find anybody outside...

April 14th 2009

The ratio is 1:2. For every even number there are 2 odd numbers. Fibonacci Series: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, ... which is even, odd, odd, even, odd, odd, even, odd, odd, even, ... the pattern...

Leonardo Fibonacci first recorded his sequence in his book Liber Abaci, which was published in 1202.