A013925 Number of labeled connected graphs with n nodes and 3 cutpoints.

60, 1920, 75600, 4663680, 469336896, 79132032000, 23121510192000, 12082931084928000, 11564306171310537216, 20625639730671895535616, 69501783433272242637312000, 447403458171641201324598067200, 5550030610876067133522251137105920

Offset: 5

Author

Stanley Selkow (sms(AT)owl.WPI.EDU)

Keywords

• nonn

Comments

Selkow paper has typographical error a(9) = 469336898. - Sean A. Irvine, Aug 29 2018

Links

• Andrew Howroyd, Table of n, a(n) for n = 5..50
• S. Selkow, The enumeration of labeled graphs by number of cutpoints, Discr. Math. 185 (1998), 183-191.

Crossrefs

Column k=3 of A370064.

Extensions

a(9) corrected and more terms from Sean A. Irvine, Aug 29 2018