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Number of simple graphs on n unlabeled nodes with exactly 2 endpoints (nodes of degree 1).
3

%I #27 Feb 02 2021 17:04:31

%S 0,1,2,3,7,25,126,968,11752,240615,8529544,534168034,59794030430,

%T 12082250628276,4446033336286696,3002923486915259644,

%U 3748228681583390913192,8696890616699403375722774,37700601714008218904828607832,306674623374061557486512987705844

%N Number of simple graphs on n unlabeled nodes with exactly 2 endpoints (nodes of degree 1).

%H Andrew Howroyd, <a href="/A325125/b325125.txt">Table of n, a(n) for n = 1..50</a>

%Y Column k=2 of A327371.

%Y Cf. A277073 (labeled case), A325115.

%K nonn

%O 1,3

%A _Andrew Howroyd_, Sep 04 2019

%E Terms a(11) and beyond from _Andrew Howroyd_, Feb 02 2021