|
|
A158001
|
|
Period 6: repeat [9, 10, 9, 4, 4, 1].
|
|
1
|
|
|
9, 10, 9, 4, 4, 1, 9, 10, 9, 4, 4, 1, 9, 10, 9, 4, 4, 1, 9, 10, 9, 4, 4, 1, 9, 10, 9, 4, 4, 1, 9, 10, 9, 4, 4, 1, 9, 10, 9, 4, 4, 1, 9, 10, 9, 4, 4, 1, 9, 10, 9, 4, 4, 1, 9, 10, 9, 4, 4, 1, 9, 10, 9, 4, 4, 1, 9, 10, 9, 4, 4, 1, 9, 10, 9, 4, 4, 1, 9, 10, 9, 4, 4, 1, 9, 10, 9, 4, 4, 1, 9, 10, 9, 4, 4, 1
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
LINKS
|
|
|
FORMULA
|
G.f.: x*(9+10*x+9*x^2+4*x^3+4*x^4+x^5)/(1-x^6).
a(n) = a(n-6) for n > 6.
a(n) = (37 - 7*cos(n*Pi) - 17*cos(n*Pi/3) - 7*cos(2*n*Pi/3) + 11*sqrt(3)*sin(n*Pi/3) - sqrt(3)*sin(2*n*Pi/3))/6. (End)
|
|
MAPLE
|
|
|
MATHEMATICA
|
|
|
PROG
|
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,easy
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|