A131083 Periodic sequence (26, 16, 6, 2, 6, 16, 26, 30).

26, 16, 6, 2, 6, 16, 26, 30, 26, 16, 6, 2, 6, 16, 26, 30, 26, 16, 6, 2, 6, 16, 26, 30, 26, 16, 6, 2, 6, 16, 26, 30, 26, 16, 6, 2, 6, 16, 26, 30, 26, 16, 6, 2, 6, 16, 26, 30, 26, 16, 6, 2, 6, 16, 26, 30, 26, 16, 6, 2, 6, 16, 26, 30, 26, 16, 6, 2, 6, 16, 26, 30, 26, 16, 6, 2, 6, 16, 26, 30

Offset

1,1

Comments

Sixth column of triangular array T defined in A131074.

Links

Table of n, a(n) for n=1..80.

Index entries for linear recurrences with constant coefficients, signature (1,0,0,-1,1).

Formula

a(n) = a(n-8).

G.f.: x*(26-10*x-10*x^2-4*x^3+30*x^4)/((1-x)*(1+x^4)).

Mathematica

PadRight[{}, 90, {26, 16, 6, 2, 6, 16, 26, 30}] (* Harvey P. Dale, Nov 02 2017 *)

Prog

(PARI) {m=80; for(n=1, m, r=(n-1)%8; print1(if(r==0||r==6, 26, if(r==1||r==5, 16, if(r==2||r==4, 6, if(r==3, 2, 30)))), ", "))}
(Magma) m:=80; [ [26, 16, 6, 2, 6, 16, 26, 30][(n-1) mod 8 + 1]: n in [1..m] ];

Crossrefs

Cf. A131074, A131030.

Sequence in context: A304138 A305044 A064267 * A203597 A040652 A154295

Adjacent sequences: A131080 A131081 A131082 * A131084 A131085 A131086

Keyword

nonn,easy,less,changed

Author

Klaus Brockhaus, following a suggestion of Paul Curtz, Jun 14 2007

Status

approved