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 A361584 #6 Mar 16 2023 19:46:31 %S A361584 1,1,3,12,88,1239,36540,2226595,277421616,69974281748,35535207035048, %T A361584 36224521019293188,74004483908461354689,302712665772844097945072, %U A361584 2477999475270966827490305948,40583406022745170376459610683073,1329552679157905406495248763876363056 %N A361584 Number of digraphs on n unlabeled nodes whose strongly connected components are directed cycles or single vertices. %F A361584 a(n) >= A361583(n). %o A361584 (PARI) A361584seq(16) \\ See PARI link in A350794 for program code. %Y A361584 The labeled version is A011266. %Y A361584 Cf. A350794, A361583, A361585 (without single vertex components). %K A361584 nonn %O A361584 0,3 %A A361584 _Andrew Howroyd_, Mar 16 2023