OFFSET
0,3
COMMENTS
LINKS
Index entries for linear recurrences with constant coefficients, signature (9,-27,27).
FORMULA
G.f.: x*(1 + 2*x)/(1 - 3*x)^3.
E.g.f.: exp(3*x)*x*(2 + 5*x)/2. - Stefano Spezia, Oct 28 2023
MATHEMATICA
Table[(3^(n-2) n(5n+1))/2, {n, 0, 30}] (* or *) LinearRecurrence[{9, -27, 27}, {0, 1, 11}, 30] (* Harvey P. Dale, Jul 21 2016 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Jun 10 2003
STATUS
approved