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Search: id:A111772
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| A111772 |
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Number of non-isomorphic Average systems with n elements. An Average system has one binary operation "avg" and satisfies the three axioms avg(A,A)=A, avg(A,B)=avg(B,A), avg(avg(A,B),avg(C,D)) = avg(avg(A,C),avg(B,D)). |
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