A126564 a(n) = floor( sin(n)*cos(n) ).

0, 0, -1, -1, 0, -1, -1, 0, -1, -1, 0, -1, -1, 0, 0, -1, 0, 0, -1, 0, 0, -1, 0, 0, -1, -1, 0, -1, -1, 0, -1, -1, 0, -1, -1, 0, 0, -1, 0, 0, -1, 0, 0, -1, 0, 0, -1, -1, 0, -1, -1, 0, -1, -1, 0, -1, -1, 0, 0, -1, 0, 0, -1, 0, 0, -1, 0, 0, -1, -1, 0, -1, -1, 0, -1, -1, 0, -1, -1, 0, 0, -1, 0, 0, -1, 0, 0, -1, 0, 0, -1, -1, 0, -1, -1, 0, -1, -1, 0, -1, -1, 0, 0

Offset

0,1

Links

Table of n, a(n) for n=0..102.

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

Cf. A000480, A000493, A126565.

Sequence in context: A288729 A335617 A286807 * A180433 A358771 A165560

Adjacent sequences: A126561 A126562 A126563 * A126565 A126566 A126567

Keyword

sign

Author

Rick L. Shepherd, Dec 27 2006

Status

approved