OFFSET
7,2
REFERENCES
J. Goldman and G.-C. Rota, The number of subspaces of a vector space, pp. 75-83 of W. T. Tutte, editor, Recent Progress in Combinatorics. Academic Press, NY, 1969.
I. P. Goulden and D. M. Jackson, Combinatorial Enumeration. Wiley, NY, 1983, p. 99.
M. Sved, Gaussians and binomials, Ars. Combinatoria, 17A (1984), 325-351.
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 7..140
MATHEMATICA
QBinomial[Range[7, 20], 7, -12] (* Harvey P. Dale, Mar 17 2012 *)
PROG
(Sage) [gaussian_binomial(n, 7, -12) for n in range(7, 13)] # Zerinvary Lajos, May 27 2009
(Magma) r:=7; q:=-12; [&*[(1-q^(n-i+1))/(1-q^i): i in [1..r]]: n in [r..15]]; // Vincenzo Librandi, Nov 02 2012
CROSSREFS
KEYWORD
sign,easy
AUTHOR
Olivier Gérard, Dec 11 1999
EXTENSIONS
More terms from Harvey P. Dale, Mar 17 2012
STATUS
approved