sequence has 5 distinct synonyms spread across 3 of its 7 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
serial arrangement in which things follow in logical order or a recurrent pattern
“the sequence of names was alphabetical”
Synonyms, antonyms and the broader and narrower relations for sequence come from Princeton University’s WordNet. Full sources and licences.
a following of one thing after another in time
“the doctor saw a sequence of patients”
the action of following in order
“he played the trumps in sequence”
several repetitions of a melodic phrase in different keys