%I #27 Mar 09 2014 13:47:55
%S 1,2,3,10,28,145,994,12215,273537
%N Number of simple class-1 graphs on n nodes.
%C First six terms look like the Euler transform of A099436, but the 7th isn't. - _Vladeta Jovovic_, Jun 30 2007; _Eric W. Weisstein_, Nov 04 2011
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/Class1Graph.html">Class 1 Graph</a>
%Y Cf. A099436 (counts of connected class 1 graphs).
%Y Cf. A099437 (counts of class 2 graphs).
%K nonn
%O 1,2
%A _Eric W. Weisstein_, Oct 15 2004
%E Corrected and extended by _Vladeta Jovovic_, Jun 30 2007
%E "Correction" reverted by _Eric W. Weisstein_, Nov 04 2011
%E a(8) from _Eric W. Weisstein_, Nov 17 2011
%E a(9) from _Eric W. Weisstein_, Nov 21 2011