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 A052450 #26 Feb 16 2025 08:32:42 %S A052450 0,1,2,6,13,37,106,409,1896,12171,105070,1262179,20797001,467871368, %T A052450 14232552451,581460254000,31720840164949 %N A052450 Number of n-node simple graphs having clique number 2. %H A052450 Keith M. Briggs, <a href="http://keithbriggs.info/cgt.html">Combinatorial Graph Theory</a> %H A052450 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/CliqueNumber.html">Clique Number.</a> %Y A052450 Cf. A052451, A052452, A052453, A077392, A077393, A077394. %Y A052450 a(n) = A006785(n) - 1. - _Falk Hüffner_, Nov 20 2015 %K A052450 nonn,more %O A052450 1,3 %A A052450 _Eric W. Weisstein_ %E A052450 2 more terms from _Eric W. Weisstein_, Nov 03 2002 %E A052450 a(10) from _Keith Briggs_, Mar 15 2006 %E A052450 a(11) from _Michael Sollami_, Jan 29 2012 %E A052450 a(12) from _Michael Sollami_, Mar 26 2012 %E A052450 More terms added using A006785 by _Falk Hüffner_, Nov 20 2015