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 A008323 #22 Apr 03 2020 21:45:02 %S A008323 1,1,1,2,3,5,12,34,218,4278,431165,162267174,201636689352, %T A008323 777816803938932,9865957936943859185,395886667549681686369527, %U A008323 53716176608076643470380213991,23524515269630339982914608683548933,35682168849414944013547274439525153167248 %N A008323 Number of simple connected regular bipartite graphs with 2n nodes. %H A008323 Brendan McKay and E. Rogoyski, <a href="http://www.combinatorics.org/Volume_2/volume2.html#N3">Latin squares of order ten</a>, Electron. J. Combinatorics, 2 (1995) #N3. %Y A008323 For n > 1, these are the row sums of triangle A008326. %Y A008323 Cf. A005142, A008324. %K A008323 nonn,hard,nice %O A008323 0,4 %A A008323 _Brendan McKay_ %E A008323 a(10) corrected and a(11) added by _Brendan McKay_, Sep 06 2018 %E A008323 a(0)=1 prepended and terms a(12) and beyond from _Andrew Howroyd_, Apr 03 2020