OFFSET
1,1
REFERENCES
Y. S. Kupitz, "On the maximal number of appearances of the minimal distance among n points in the plane", in Intuitive geometry: Proceedings of the 3rd international conference held in Szeged, Hungary, 1991; Amsterdam: North-Holland: Colloq. Math. Soc. Janos Bolyai. 63, 217-244.
LINKS
Michael De Vlieger, Table of n, a(n) for n = 1..10000
Li Gan, Stéphane Ouvry, and Alexios P. Polychronakos, Algebraic area enumeration of random walks on the honeycomb lattice, arXiv:2107.10851 [math-ph], 2021.
Greg Malen, Érika Roldán, and Rosemberg Toalá-Enríquez, Extremal {p, q}-Animals, Ann. Comb. (2023). See Corollary 1.9 at p. 8.
FORMULA
It is easy to use the formula of Harborth given in A135708 to show that a(n) = 2*ceiling(sqrt(12*n-3)). - Sascha Kurz, Mar 05 2008
2*A135708(n) - a(n) = 6n. - Tanya Khovanova, Mar 07 2008
MATHEMATICA
Table[2Ceiling[Sqrt[12n-3]], {n, 120}] (* Harvey P. Dale, Dec 29 2019 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Tanya Khovanova, Mar 04 2008
EXTENSIONS
More terms from N. J. A. Sloane, Mar 05 2008
STATUS
approved