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 A350915 #7 Jan 29 2022 22:31:39 %S A350915 1,1,3,10,39,169,876,4834,29316,189054,1294382,9321232,70326820, %T A350915 553433559,4528840412,38432156859,337454775045,3059843449398, %U A350915 28602687303185,275222034228537,2722343346822614,27647618196693537,287970349621911635,3073082817450997700,33568654163238906968 %N A350915 Number of weakly connected oriented graphs with n arcs. %H A350915 Andrew Howroyd, <a href="/A350915/b350915.txt">Table of n, a(n) for n = 0..50</a> %o A350915 (PARI) \\ See A350734 for G, InvEulerMTS. %o A350915 seq(n)=Vec(subst(Pol(InvEulerMTS(sum(i=0, n, G(i, y+O(y^n))*x^i, O(x*x^n)))), x, 1)) %Y A350915 Row sums of A350914. %Y A350915 Column sums of A350734. %Y A350915 Cf. A053454, A086345. %K A350915 nonn %O A350915 0,3 %A A350915 _Andrew Howroyd_, Jan 29 2022