OFFSET
0,2
LINKS
Index entries for linear recurrences with constant coefficients, signature (14,-55,42).
FORMULA
G.f.: 1/(1-7*x)-1/(1-6*x)+1/(1-x).
E.g.f.: e^(7*x)-e^(6*x)+e^x.
a(n) = 13*a(n-1)-42*a(n-2)+30 with a(0)=1, a(1)=2. [Vincenzo Librandi, Jul 21 2010]
MAPLE
MATHEMATICA
Table[7^n - 6^n + 1, {n, 0, 30}] (* Wesley Ivan Hurt, Jan 28 2014 *)
PROG
(PARI) a(n)= 7^n-6^n+1 \\ Charles R Greathouse IV, Dec 22 2011
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Mohammad K. Azarian, Jan 31 2009
STATUS
approved