OFFSET
0,2
COMMENTS
The Cartesian coordinates of the points of a counterclockwise spiral on an hexagonal grid are given by x(n) = a(n)/2 and by y(n)= A307012(n) * sqrt(3)/2.
LINKS
Hugo Pfoertner, Table of n, a(n) for n = 0..10000
Hugo Pfoertner, Illustration of spiral.
CROSSREFS
KEYWORD
sign
AUTHOR
Hugo Pfoertner, Oct 28 2019
STATUS
approved