OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..100
Index entries for linear recurrences with constant coefficients, signature (3,3).
FORMULA
G.f.: 3*x*(1-2*x)/(1-3*x-3*x^2). - Bruno Berselli, May 24 2011
MATHEMATICA
LinearRecurrence[{3, 3}, {3, 3}, 40]
PROG
(Maxima) a[1]:3$ a[2]:3$ a[n]:=3*a[n-1]+3*a[n-2]$ makelist(a[n], n, 1, 26); /* Bruno Berselli, May 24 2011 */
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Harvey P. Dale, Apr 26 2011
STATUS
approved