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A246320 Number of Steinhaus graphs of order n and diameter 3. 2
2, 6, 15, 33, 68, 141, 282, 553, 1071, 2039, 3786, 6958 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,1

COMMENTS

It would be good to fill in the values for n<4.

REFERENCES

Brigham, Robert C.; Dutton, Ronald D. Distances and diameters in Steinhaus graphs. Proceedings of the Twenty-first Southeastern Conference on Combinatorics, Graph Theory, and Computing (Boca Raton, FL, 1990). Congr. Numer. 76 (1990), 7--14. MR1140412 (92h:05050)

LINKS

Table of n, a(n) for n=4..15.

CROSSREFS

Cf. A246319, A246321.

Sequence in context: A327598 A258348 A262151 * A101352 A192980 A281970

Adjacent sequences:  A246317 A246318 A246319 * A246321 A246322 A246323

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Aug 27 2014

STATUS

approved

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Last modified February 19 03:54 EST 2020. Contains 332032 sequences. (Running on oeis4.)