OFFSET
1,3
LINKS
Peter Brass, The maximum number of second smallest distances in finite planar sets, Discrete & Computational Geometry 7.1 (1992): 371-379.
Peter Brass, Annotated version of Fig. 1 from Brass (1992), illustrating small values of a(n).
CROSSREFS
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Nov 01 2017
STATUS
approved