A325125 Number of simple graphs on n unlabeled nodes with exactly 2 endpoints (nodes of degree 1).

0, 1, 2, 3, 7, 25, 126, 968, 11752, 240615, 8529544, 534168034, 59794030430, 12082250628276, 4446033336286696, 3002923486915259644, 3748228681583390913192, 8696890616699403375722774, 37700601714008218904828607832, 306674623374061557486512987705844

Offset: 1

Author

Andrew Howroyd, Sep 04 2019

Keywords

• nonn

Links

• Andrew Howroyd, Table of n, a(n) for n = 1..50

Crossrefs

Column k=2 of A327371.

Cf. A277073 (labeled case), A325115.

Extensions

Terms a(11) and beyond from Andrew Howroyd, Feb 02 2021