Basic normal quotients of 7-valent symmetric graphs of order 2pq^n are an infinite family of dihedrants of order 2p (p≡1 mod 7) together with six graphs of order at most 310, implying finiteness of the 2-arc-transitive ones.
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Symmetric graphs of valency seven and their basic normal quotient graphs
Basic normal quotients of 7-valent symmetric graphs of order 2pq^n are an infinite family of dihedrants of order 2p (p≡1 mod 7) together with six graphs of order at most 310, implying finiteness of the 2-arc-transitive ones.