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 A350907 #5 Jan 22 2022 18:29:23 %S A350907 1,1,3,8,29,111,522,2604,14459,85796,544753,3659313,25902251, %T A350907 192171887,1489090036,12011329453,100583184087,872346402439, %U A350907 7819597099285,72313198682817,688784601395670,6747614973580663,67896777481378196,700913648767703716,7415270780191604414,80316990564932960558 %N A350907 Number of unlabeled initially connected digraphs with n arcs. %o A350907 (PARI) A350907seq(15) \\ See PARI link in A350794 for program code. %Y A350907 Column sums of A057277. %Y A350907 Cf. A051421 (by vertices), A350752, A350796, A350798, A350906. %K A350907 nonn %O A350907 0,3 %A A350907 _Andrew Howroyd_, Jan 21 2022