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 A319897 #17 Mar 18 2020 18:45:09
%S A319897 1,1,2,1,6,7,195,984,648947,35494648,689162614688,250087643676776,
%T A319897 116889497942206867366
%N A319897 Number of connected regular loopless multigraphs on n unlabeled nodes with degree up to n.
%C A319897 Initial terms computed using 'Nauty and Traces'.
%H A319897 Brendan McKay and Adolfo Piperno, <a href="http://pallini.di.uniroma1.it">Nauty and Traces</a>
%F A319897 a(n) = Sum_{k=0..n} A328682(n, k). - _Andrew Howroyd_, Mar 18 2020
%Y A319897 Cf. A289986, A325476, A328682.
%K A319897 nonn,more
%O A319897 0,3
%A A319897 _Natan Arie Consigli_, Nov 28 2018
%E A319897 a(1), a(8) corrected and a(10)-a(12) added by _Andrew Howroyd_, Mar 18 2020