OFFSET
0,2
LINKS
Index entries for linear recurrences with constant coefficients, signature (18,-111,278,-240)
FORMULA
From Vincenzo Librandi, Mar 19 2011: (Start)
a(n) = 18*a(n-1) - 111*a(n-2) + 278*a(n-3) - 240*a(n-4), n >= 4.
a(n) = 13*a(n-1) - 40*a(n-2) + 3^(n+1) - 2^(n+1), n >= 2. (End)
a(n) = 4*8^(n+2)/45 - 2^(n+2)/9 - 5^(n+3)/18 + 3^(n+3)/10. - R. J. Mathar, Mar 19 2011
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved