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 A335820 #25 Mar 08 2022 03:29:13 %S A335820 1,1,1,1,1,4,5,5,10,2,11,3,2,1,2,2,1,1,5,1,1,13,1,20,9,8,7,1,2,1,1,9, %T A335820 18,1,1,5,11 %N A335820 Number of squarefree graphs on n nodes with maximal number of edges. %C A335820 Number of squarefree graphs on n nodes with A006855(n) edges. %H A335820 C. R. J. Clapham, A. Flockhart, and J. Sheehan, <a href="https://doi.org/10.1002/jgt.3190130107">Graphs without Four-Cycles</a>, Journal of Graph Theory, 31 (1989), 29-47. %H A335820 D. B. West, A. Bialostocki, and J. Schonheim, <a href="https://www.jstor.org/stable/2324941">E3387 (Large Graphs with No 4-cycle)</a>, The American Mathematical Monthly, 98 (Aug. - Sep. 1991), 653-655. %e A335820 There are 2 squarefree graphs on 10 nodes that have maximal number of edges. %Y A335820 Unlabeled version of A191966. %Y A335820 Cf. A006786, A006855, A077269, A300756. %K A335820 nonn,more %O A335820 1,6 %A A335820 _Jason Zimba_, Jul 22 2020 %E A335820 a(22)-a(37) from _Brendan McKay_, Mar 08 2022