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 A350492 #7 Jan 09 2022 22:22:06 %S A350492 1,1,1,2,5,14,44,153,584,2414,10732,50909,256198,1360645,7593530, %T A350492 44366458,270517289,1716555943,11308051214,77170484915,544525867544, %U A350492 3965944595335,29769162604337,229970873746105,1826057472681595,14886348784740516 %N A350492 Number of unlabeled acyclic digraphs with n arcs and a global source and sink. %H A350492 Andrew Howroyd, <a href="/A350492/b350492.txt">Table of n, a(n) for n = 0..40</a> %o A350492 (PARI) A350492seq(20) \\ See PARI link in A122078 for program code. %Y A350492 Column sums of A350491. %Y A350492 Cf. A122078, A345258, A350451, A350490. %K A350492 nonn %O A350492 0,4 %A A350492 _Andrew Howroyd_, Jan 08 2022