OFFSET
0,3
COMMENTS
a(n) = floor(As(n) - Ac(n)), where Ac(n) is the area of the circle of radius n, and As(n) is the area of square with side length 2n.
MATHEMATICA
Floor[(4-Pi)#^2]&/@Range[0, 60] (* Harvey P. Dale, Jan 10 2020 *)
PROG
(Python)
import math
for n in range(77): print(str(int(n*n*(4-math.pi))), end=', ')
CROSSREFS
KEYWORD
nonn
AUTHOR
Alex Ratushnyak, Jan 11 2014
STATUS
approved