A076441 Let u(1) = u(2) = u(3) = 1; u(n) = sign(u(n-1)-u(n-2))*u(n-3), then a(n) = 1+u(n).

2, 2, 2, 1, 0, 0, 1, 0, 2, 1, 2, 2, 1, 0, 0, 1, 0, 2, 1, 2, 2, 1, 0, 0, 1, 0, 2, 1, 2, 2, 1, 0, 0, 1, 0, 2, 1, 2, 2, 1, 0, 0, 1, 0, 2, 1, 2, 2, 1, 0, 0, 1, 0, 2, 1, 2, 2, 1, 0, 0, 1, 0, 2, 1, 2, 2, 1, 0, 0, 1, 0, 2, 1, 2, 2, 1, 0, 0, 1, 0, 2, 1, 2, 2, 1, 0, 0, 1, 0, 2, 1, 2, 2, 1, 0, 0, 1, 0, 2, 1, 2, 2, 1, 0, 0

Offset

1,1

Links

Table of n, a(n) for n=1..105.

Formula

a(n) is a 9-periodic sequence with period (1, 0, 0, 1, 0, 2, 1, 2, 2)

Mathematica

PadRight[{2}, 120, {1, 2, 2, 1, 0, 0, 1, 0, 2}] (* Harvey P. Dale, Nov 30 2018 *)

Crossrefs

Sequence in context: A131079 A334889 A078336 * A319289 A124747 A334888

Adjacent sequences: A076438 A076439 A076440 * A076442 A076443 A076444

Keyword

nonn

Author

Benoit Cloitre, Nov 24 2002

Status

approved