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 A076021 #17 Dec 09 2021 00:48:38 %S A076021 1,0,1,1,0,0,4,0,20,241,0,9801188 %N A076021 Number of fully idempotent systems with n elements with one binary operation satisfying the equation B(AB)=A (idempotent semisymmetric quasigroups). %C A076021 a(n) = 0 whenever n == 2 (mod 3). %C A076021 a(n) is also the number of unipotent semisymmetric quasigroups of order n+1 and is also the number of semisymmetric loops of order n+1. %H A076021 Brendan D. McKay and Ian M. Wanless, <a href="https://doi.org/10.1002/jcd.21814">Enumeration of Latin squares with conjugate symmetry</a>, J. Combin. Des. 30 (2022), 105-130. %Y A076021 Cf. A076016-A076020. %K A076021 nonn,hard,more %O A076021 1,7 %A A076021 Richard C. Schroeppel, Oct 29 2002 %E A076021 a(10)-a(12) from _Ian Wanless_, Dec 08 2021