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Is it possible that the number of $\mathcal{T}$-algebras is an arithmetic progression?

For a single-sorted algebraic theory $\mathcal{T}$ denote by $t_n$ the number of $\mathcal{T}$-algebras with $n$ elements (up to isomorphism). Is there an example for $\mathcal{T}$ such that ...
Martin Brandenburg's user avatar