A003317 Number of unlabeled minimally 2-connected graphs with n nodes (also called "blocks"). (Formerly M0799)

1, 1, 2, 3, 6, 12, 28, 68, 184, 526, 1602, 5075, 16711, 56428, 195003, 685649, 2447882, 8850157, 32359428, 119492766, 445236635, 1672636369, 6331624545, 24138404479, 92640942148, 357805122286, 1390318899884, 5433781135206

Offset

3,3

Comments

The Pootheri references also contain the edge breakups for each term.

References

A. M. Hobbs, A catalog of minimal blocks, J. Res. National Bureau Standards, B 77 (1973), 53-60.

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Links

Table of n, a(n) for n=3..30.

Audace A. V. Dossou-Olory, Cut and pendant vertices and the number of connected induced subgraphs of a graph, arXiv:1910.04552 [math.CO], 2019.

A. M. Hobbs, A catalog of minimal blocks, J. Res. National Bureau Standards, B 77 (1973), 53-60. (Annotated scanned copy)

Hu, Guan Zhang; Liu, Guo Qing; Liu, Shi; He, Jian Ping; Enumeration of minimally 2-connected graphs by means of group theory, (Chinese) Acta Math. Appl. Sinica 12 (1989), no. 2, 164-173.

S. K. Pootheri, Counting classes of labeled 2-connected graphs, M.S. Dissertation, University of Georgia, 2000.

S. K. Pootheri, Counting classes of labeled 2-connected graphs, M.S. Thesis, University of Georgia, 2000. [Local copy]

S. K. Pootheri, Characterizing and counting classes of unlabeled 2-connected graphs, Ph. D. Dissertation, University of Georgia, 2000.

S. K. Pootheri, Characterizing and counting classes of unlabeled 2-connected graphs, Ph. D. Dissertation, University of Georgia, 2000. [Local copy]

Crossrefs

Cf. A054316, A054317, A002218.

Sequence in context: A073431 A273873 A337717 * A145062 A300323 A375181

Adjacent sequences: A003314 A003315 A003316 * A003318 A003319 A003320

Keyword

nonn,nice

Author

N. J. A. Sloane

Extensions

More terms from Sridar K. Pootheri (sridar(AT)math.uga.edu), Feb 25 2000

Status

approved