OFFSET
0,1
FORMULA
a(n) = floor(sin(n)*cos(n)).
a(n) = floor(sin(2n)/2). [Wesley Ivan Hurt, Jun 22 2013]
PROG
(PARI) a(n) = floor(sin(n)*cos(n))
CROSSREFS
KEYWORD
sign
AUTHOR
Rick L. Shepherd, Dec 27 2006
STATUS
approved