The main table in the OEIS is a collection of over 380,000 sequences of integers. The entry for each sequence gives some or all of:

the beginning of the sequence
its name or description
a graph of the sequence
additional comments
the offset (index of first term)
references or links
formulas
computer programs
cross-references to other sequences
the sequence converted to music
the name of the person who submitted it
the history of the OEIS entry