A076817 Let u(1)=u(2)=1, u(n)=(3^floor(u(n-1)/2)+1)/u(n-2); then a(n)=10*u(n).

10, 10, 20, 40, 50, 25, 8, 8, 25, 50, 40, 20, 10, 10, 20, 40, 50, 25, 8, 8, 25, 50, 40, 20, 10, 10, 20, 40, 50, 25, 8, 8, 25, 50, 40, 20, 10, 10, 20, 40, 50, 25, 8, 8, 25, 50, 40, 20, 10, 10, 20, 40, 50, 25, 8, 8, 25, 50, 40, 20, 10, 10, 20, 40, 50, 25, 8, 8, 25, 50, 40, 20

Offset

1,1

Links

Table of n, a(n) for n=1..72.

Index entries for linear recurrences with constant coefficients, signature (1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1).

Formula

12-periodic with period (10, 10, 20, 40, 50, 25, 8, 8, 25, 50, 40, 20)

Mathematica

LinearRecurrence[{1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1}, {10, 10, 20, 40, 50, 25, 8, 8, 25, 50, 40}, 72] (* Ray Chandler, Aug 26 2015 *)
PadRight[{}, 120, {10, 10, 20, 40, 50, 25, 8, 8, 25, 50, 40, 20}] (* Harvey P. Dale, Mar 27 2017 *)

Crossrefs

Sequence in context: A368362 A022093 A332874 * A324494 A344104 A200984

Adjacent sequences: A076814 A076815 A076816 * A076818 A076819 A076820

Keyword

nonn

Author

Benoit Cloitre, Nov 24 2002

Status

approved