OFFSET
0,2
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..400
Index entries for linear recurrences with constant coefficients, signature (17,-100,308,-574,686,-532,260,-73,9).
FORMULA
G.f.: -(10*x^8+1071*x^7+10627*x^6+20497*x^5+8373*x^4-167*x^3-83*x^2-9*x+1) / ((x-1)^8*(9*x-1)). - Colin Barker, Mar 20 2015
MATHEMATICA
Table[9^n - n^7, {n, 0, 19}] (* Michael De Vlieger, Mar 20 2015 *)
LinearRecurrence[{17, -100, 308, -574, 686, -532, 260, -73, 9}, {1, 8, -47, -1458, -9823, -19076, 251505, 3959426, 40949569}, 20] (* Harvey P. Dale, Mar 23 2018 *)
PROG
(Magma) [9^n-n^7: n in [0..25]]; // Vincenzo Librandi, Jul 06 2011
(PARI) Vec(-(10*x^8+1071*x^7+10627*x^6+20497*x^5+8373*x^4-167*x^3-83*x^2-9*x+1)/((x-1)^8*(9*x-1)) + O(x^100)) \\ Colin Barker, Mar 20 2015
CROSSREFS
KEYWORD
sign,easy
AUTHOR
STATUS
approved