A140976 Period length 10: repeat 8, 8, 6, 6, 4, 4, 2, 2, 0, 0.

8, 8, 6, 6, 4, 4, 2, 2, 0, 0, 8, 8, 6, 6, 4, 4, 2, 2, 0, 0, 8, 8, 6, 6, 4, 4, 2, 2, 0, 0, 8, 8, 6, 6, 4, 4, 2, 2, 0, 0, 8, 8, 6, 6, 4, 4, 2, 2, 0, 0, 8, 8, 6, 6, 4, 4, 2, 2, 0, 0, 8, 8, 6, 6, 4, 4, 2, 2, 0, 0, 8, 8, 6, 6, 4, 4, 2, 2, 0, 0, 8, 8, 6, 6, 4, 4, 2, 2, 0, 0

Offset: 0

Author

Paul Curtz, Jul 28 2008

Keywords

• nonn
• easy
• less

Comments

The subsequence of even terms of A140975.

Links

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

Crossrefs

Cf. A059631, A140975, A177154.

Programs

Mathematica

PadRight[{},100,{8,8,6,6,4,4,2,2,0,0}] (* Harvey P. Dale, Jun 03 2012 *)

Formula

Also doubled A059631(n+1) mod 10.

G.f.: ( -8-6*x^2-4*x^4-2*x^6 ) / ( (x-1)*(1+x+x^2+x^3+x^4)*(1-x+x^2-x^3+x^4) ). - R. J. Mathar, Jul 08 2011

Extensions

More terms from Jinyuan Wang, Feb 26 2020