OFFSET
2,2
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 2..200
Index entries for linear recurrences with constant coefficients, signature (73, -584, 512).
FORMULA
G.f.: x^2/[(1-x)(1-8x)(1-64x)].
a(n) = Product_{i=1..2} (8^(n-i+1)-1)/(8^i-1), by definition. - Vincenzo Librandi, Aug 05 2016
MATHEMATICA
CoefficientList[Series[1/((1-x)(1-8x)(1-64x)), {x, 0, 25}], x] (* Harvey P. Dale, Mar 13 2011 *)
Table[QBinomial[n, 2, 8], {n, 2, 20}] (* Vincenzo Librandi, Aug 05 2016 *)
PROG
(Sage) [gaussian_binomial(n, 2, 8) for n in range(2, 16)] # Zerinvary Lajos, May 28 2009
(Magma) r:=2; q:=8; [&*[(1-q^(n-i+1))/(1-q^i): i in [1..r]]: n in [r..20]]; // Vincenzo Librandi, Aug 05 2016
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
Offset changed by Vincenzo Librandi, Aug 05 2016
STATUS
approved