The Online Encyclopedia of Integer Sequences (OEIS) is currently located here but soon to become operational at its new website, where it combines the old interface with a new wiki interface with better inter-page linking and more features.
The OEIS is an invaluable tool for finding out for:
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Finding the ne next few terms and general rule for a given sequence you have.
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Finding the first few terms of a sequence, graphing it, or learning more about it.
What Is Research? 
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