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Number of simple integral graphs on n nodes.
3

%I #19 May 17 2023 10:34:17

%S 1,2,3,6,10,20,33,71,121,269,492

%N Number of simple integral graphs on n nodes.

%C Generated at the suggestion of _Ed Pegg Jr_.

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/IntegralGraph.html">Integral Graph</a>

%F Euler transform of A064731. - _Eric M. Schmidt_, Mar 23 2015

%F a(n) = A287154(n) + A064731(n).

%Y Cf. A064731 (number of simple connected integral graphs).

%Y Cf. A287154 (number of simple disconnected integral graphs).

%Y Cf. A363065 (number of Laplacian integral graphs).

%K nonn,more

%O 1,2

%A _Eric W. Weisstein_, Oct 18 2002

%E a(1) corrected and a(10)-a(11) added (using A064731) by _Eric M. Schmidt_, Mar 23 2015