OFFSET
0,1
COMMENTS
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (2, -1).
FORMULA
a(n) = (7 + n)*(8 + n)/2 = A000217(7+n) for 0 <= n <= 7, a(n) = a(n-1) + 15 for n >= 8.
G.f.: (28 - 48*x + 21*x^2 - x^9)/(1 - x)^3. - G. C. Greubel, Jul 13 2016
MATHEMATICA
CoefficientList[Series[(28 - 48*x + 21*x^2 - x^9)/(1 - x)^3, {x, 0, 25}], x] (* G. C. Greubel, Jul 13 2016 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Jaroslav Krizek, Nov 18 2009
STATUS
approved