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A204329 Irregular triangle read by rows: T(n,k) (n >= 2) is the number of cubic graphs on 2n nodes with diameter k. 0
1, 0, 2, 0, 2, 3, 0, 1, 15, 2, 1, 0, 0, 34, 43, 6, 2, 0, 0, 34, 351, 93, 24, 6, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,3

COMMENTS

The number of terms in each row (the maximal diameter) begins 1,2,3,5,6,8,... . I don't know how this sequence continues.

LINKS

Table of n, a(n) for n=2..26.

F. C. Bussemaker, S. Cobeljic, L. M. Cvetkovic and J. J. Seidel, Computer investigations of cubic graphs, T.H.-Report 76-WSK-01, Technological University Eindhoven, Dept. Mathematics, 1976.

EXAMPLE

Triangle begins:

1

0 2

0 2 3

0 1 15 2 1

0 0 34 43 6 2

0 0 34 351 93 24 6 1

...

CROSSREFS

Cf. A002851.

Sequence in context: A132814 A058623 A209689 * A111565 A141099 A127710

Adjacent sequences:  A204326 A204327 A204328 * A204330 A204331 A204332

KEYWORD

nonn,more,tabf

AUTHOR

N. J. A. Sloane, Jan 14 2012

STATUS

approved

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Last modified December 21 10:09 EST 2014. Contains 252304 sequences.