%I #15 Mar 07 2020 00:03:40
%S 1,4,24,131,663,3252,15772,75415,359307,1711908,8191607,39500169,
%T 192525021,950868860,4769060224,24331970791,126457607026,670143402073,
%U 3623530476832,19998343352758,112668088476243,647904733883526
%N Number of graphs with n nodes and n+2 edges.
%D J. Riordan, An Introduction to Combinatorial Analysis, Wiley, 1958, p. 146.
%H Sean A. Irvine, <a href="/A048180/b048180.txt">Table of n, a(n) for n = 4..36</a>
%H M. L. Stein and P. R. Stein, <a href="http://dx.doi.org/10.2172/4180737">Enumeration of Linear Graphs and Connected Linear Graphs up to p = 18 Points</a>. Report LA-3775, Los Alamos Scientific Laboratory of the University of California, Los Alamos, NM, Oct 1967
%Y Cf. A008406.
%K nonn,easy
%O 4,2
%A _N. J. A. Sloane_
%E More terms from _Vladeta Jovovic_, Jan 03 2000
%E More terms from _Sean A. Irvine_, Jun 07 2017
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