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 A350798 #6 Jan 22 2022 18:30:11 %S A350798 1,1,2,6,21,84,387,1953,10802,64267,408489,2750686,19518841,145236878, %T A350798 1128884559,9135566309,76758391212,667993213393,6008434514996, %U A350798 55755719348210,532896254763646,5238211003916685,52885470406233727,547751388283907208,5813693205313803535,63170000832869927871 %N A350798 Number of unlabeled digraphs with n arcs and a global source (or sink). %o A350798 (PARI) A350798seq(15) \\ See PARI link in A350794 for program code. %Y A350798 Column sums of A350797. %Y A350798 Cf. A350360, A350752, A350796, A350906, A350907. %K A350798 nonn %O A350798 0,3 %A A350798 _Andrew Howroyd_, Jan 21 2022