This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A245686 #11 May 27 2025 06:28:37 %S A245686 2,21,395,10180,322095,12194323,536197356,26904958363,1516697994964 %N A245686 Number of nonisomorphic synchronizing strongly connected binary n-state automata without output under input permutations. %C A245686 Number of 2-sets of transformations, up to conjugation, generating a transitive semigroup on n points that contains a constant transformation. %H A245686 Jakub Kowalski and Marek Szykuła, <a href="https://arxiv.org/abs/1301.2092">The Černý conjecture for small automata: experimental report</a>, arXiv:1301.2092 [cs.FL], January 2013. %H A245686 James Mitchell, <a href="http://www-groups.mcs.st-andrews.ac.uk/~jamesm/data.php">Semigroups data</a> (contains links to files containing the 2-element sets of transformations on n points (up to conjugation) which generate a transitive semigroup containing a constant transformation). %K A245686 nonn,more %O A245686 2,1 %A A245686 _James Mitchell_, Jul 29 2014