OFFSET
0,2
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (7,-21,35,-35,21,-7,1).
FORMULA
G.f.: -729*x*(1+x)*(x^4 + 56*x^3 + 246*x^2 + 56*x + 1)/(x-1)^7. - R. J. Mathar, Jul 07 2017
MATHEMATICA
(3Range[0, 20])^6 (* Harvey P. Dale, May 08 2011 *)
PROG
(Magma) [(3*n)^6: n in [0..25]]; // Vincenzo Librandi, May 09 2011
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved