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 A324218 #30 Jun 02 2025 17:24:16
%S A324218 0,0,1,6,19,49,120,263,571,1149,2259,4218,7679,13437,22952,38013,
%T A324218 61580,97309,150838,229045,342048,502066,726318,1035482,1457677,
%U A324218 2026369,2785873,3788494,5101847,6805192,8998964,11799997,15353938,19829063,25431994,32400113,41021075,51623423
%N A324218 Number of connected n-regular loopless multigraphs on six unlabeled nodes.
%C A324218 Multigraphs are loopless.
%C A324218 Terms computed using 'nauty and Traces' (see the link).
%H A324218 Brendan McKay and Adolfo Piperno, <a href="http://pallini.di.uniroma1.it">nauty and Traces</a>
%o A324218 (nauty) for ((n=0;n<50;n++)); do geng -c -d1 6 -q | multig -r${n} -u; done
%Y A324218 Row n=6 of A328682.
%Y A324218 Cf. A324221, A324217.
%K A324218 nonn
%O A324218 0,4
%A A324218 _Natan Arie Consigli_, Feb 25 2019