> For example, +30 and 1086 for A000045.
The +30 is the sequence's query score -- how well it matches the query.
You get 100 points for matching ordering (for example, having 1 3 5 not 1 2 3 4 5 when the query is 1 3 5).
You get 10 points for matching terms in certain lines (for example, sequence data counts more, and sequence number counts a lot more).
The 1086 is the number of sequences in the database that reference the given sequence.
The "relevance" sort is by query score, with ties broken by reference count.