|
Search: id:A131083
|
|
|
| A131083 |
|
Periodic sequence (26, 16, 6, 2, 6, 16, 26, 30). |
|
+0
6
|
|
| 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
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
COMMENT
|
Sixth column of triangular array T defined in A131074.
|
|
FORMULA
|
a(1) = a(7) = 26, a(2) = a(6) = 16, a(3) = a(5) = 6, a(4) = 2, a(8) = 30; for n > 8, a(n) = a(n-8).
G.f.: (26-10*x-10*x^2-4*x^3+30*x^4)/((1-x)*(1+x^4))
a(n)=(1/28)*{30*(n mod 8)+2*[(n+1) mod 8]-19*[(n+2) mod 8]-19*[(n+3) mod 8]+2*[(n+4) mod 8]+30*[(n+5) mod 8]+51*[(n+6) mod 8]+51*[(n+7) mod 8]}, with n>=0. - Paolo P. Lava & Giorgio Balzarotti (ppl(AT)spl.at), Jun 19 2007
|
|
PROGRAM
|
(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: A036168 A005606 A064267 this_sequence A040652 A072360 A093538
Adjacent sequences: A131080 A131081 A131082 this_sequence A131084 A131085 A131086
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), following a suggestion of Paul Curtz (bpcrtz(AT)free.fr), Jun 14 2007
|
|
|
Search completed in 0.002 seconds
|
