%I #12 Oct 12 2017 04:19:43
%S 1,2,6,20,93
%N Erroneous version of A000421.
%D Cadogan, C. C. Graph-lattices and the enumeration of linear graphs. 1970 Proc. Louisiana Conf. on Combinatorics, Graph Theory and Computing (Louisiana State Univ., Baton Rouge, La., 1970) pp. 61--86 Louisiana State Univ., Baton Rouge, La. MR0269553 (42 #4448).
%K dead
%O 1,2
%A _N. J. A. Sloane_, Mar 30 2012