A057133 Number of equivalence classes of self-dual 3-valued Post functions of n variables under action of symmetric group S_n.
3, 18, 3645, 317831937966, 3695220735363494263609015164945808626, 121096725674945775281820931369251071805435386335925283528419283108512015348357219417301307065046229239236569208945
Offset: 1
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