OFFSET
2,2
COMMENTS
a(n) <= A024610(n-1) - 1.
LINKS
Peter Kagey, Table of n, a(n) for n = 2..10000
EXAMPLE
For n = 4, the a(4) = 4 sizes of equilateral triangles are 1, sqrt(3), 2, and 3. For example,
* o * *
* * * o o o o o
o o o o o * * o * o o o
o o o o, o * o o, o o o o, and * o o *.
For n = 7, the a(7) = 11 equilateral triangles have side lengths 1, sqrt(3), 2, sqrt(7), 3, sqrt(12), sqrt(13), 4, sqrt(21), 5, and 6.
CROSSREFS
KEYWORD
nonn
AUTHOR
Peter Kagey, Oct 27 2019
STATUS
approved