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 A341473 #16 Feb 27 2021 10:58:25 %S A341473 1,1,4,39,921,47462,5205915,1161039833,516101770210 %N A341473 The number of antitransitive relations on n labeled nodes. %C A341473 A relation is antitransitive if xRy and yRz implies "not xRz". As such, antitransitive relations are always irreflexive. %H A341473 Wikipedia, <a href="https://en.wikipedia.org/wiki/Intransitivity#Antitransitivity">Intransitivity</a>. %Y A341473 Number of relations on labeled nodes: A000110 (equivalence), A002416 (unrestricted), A006125 (symmetric), A006905 (transitive), A047656 (reflexive and antisymmetric), A083667 (antisymmetric), A341471 (antisymmetric and antitransitive). %K A341473 nonn,more %O A341473 0,3 %A A341473 _Peter Kagey_, Feb 13 2021 %E A341473 a(6)-a(8) from _Bert Dobbelaere_, Feb 27 2021