OFFSET
2,1
COMMENTS
a(n)/n^4 lies in the interval[0.112, 0.123] for all 5 < n < 120.
LINKS
Mark S. Fischler, Table of n, a(n) for n = 2..115
Mark S. Fischler, CPP code which generates up to 118 terms
Mathematics Stack Exchange user Adhvaitha, Number of distinct angles that can be formed on a square grid
EXAMPLE
For n=2, a(2)=2 as only angles of Pi/2 and Pi/4 can be formed on the vertices of a 2 X 2 square. For n=3, 8 additional angles can be formed, including 3*Pi/4 and one other obtuse angle, and six new acute angles; thus a(3)=10.
PROG
(C++) See links.
CROSSREFS
KEYWORD
nonn
AUTHOR
Mark S. Fischler, Dec 18 2014
STATUS
approved