OFFSET
1,3
COMMENTS
The ratio k(n) /(2*j(n)) tends to sqrt(6) as n increases
LINKS
Index entries for linear recurrences with constant coefficients, signature (0,0,10,0,0,-1). [R. J. Mathar, May 22 2010]
FORMULA
j(1)=0, j(2)=1, j(3)=2, j(4)=5, j(5)=10*j(2)+j(3), j(6)=10*j(3)+j(2), j(7)=10*j(4)+j(1) then j(n)=10*j(n-3)-j(n-6).
a(n) = +10*a(n-3) -a(n-6). G.f.: x^2*(1+2*x+5*x^2+2*x^3+x^4)/(1-10*x^3+x^6). [R. J. Mathar, May 22 2010]
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Pierre CAMI, Apr 29 2005
EXTENSIONS
More terms from Jon E. Schoenfield, May 16 2010
STATUS
approved