A013924 Number of labeled connected graphs with n nodes and 2 cutpoints.

12, 180, 4560, 211680, 17186624, 2416430016, 597615868800, 266262716016000, 218583901063537152, 336744209796848156160, 987653716558634390487040, 5576385411303897176201779200, 61117320790343064985205192540160

Offset

4,1

Links

Andrew Howroyd, Table of n, a(n) for n = 4..50

S. Selkow, The enumeration of labeled graphs by number of cutpoints, Discr. Math. 185 (1998), 183-191.

Crossrefs

Column k=2 of A370064.

Sequence in context: A001814 A370750 A327079 * A145560 A332960 A230345

Adjacent sequences: A013921 A013922 A013923 * A013925 A013926 A013927

Keyword

nonn

Author

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

Extensions

More terms from Sean A. Irvine, Aug 29 2018

Status

approved