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 A077027 #20 Feb 16 2025 08:32:48 %S A077027 1,2,3,6,10,20,33,71,121,269,492 %N A077027 Number of simple integral graphs on n nodes. %C A077027 Generated at the suggestion of _Ed Pegg Jr_. %H A077027 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/IntegralGraph.html">Integral Graph</a> %F A077027 Euler transform of A064731. - _Eric M. Schmidt_, Mar 23 2015 %F A077027 a(n) = A287154(n) + A064731(n). %Y A077027 Cf. A064731 (number of simple connected integral graphs). %Y A077027 Cf. A287154 (number of simple disconnected integral graphs). %Y A077027 Cf. A363065 (number of Laplacian integral graphs). %K A077027 nonn,more %O A077027 1,2 %A A077027 _Eric W. Weisstein_, Oct 18 2002 %E A077027 a(1) corrected and a(10)-a(11) added (using A064731) by _Eric M. Schmidt_, Mar 23 2015