9,2

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.

(Other) sage: [gaussian_binomial(n, 9, -6) for n in xrange(9, 16)] # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), May 25 2009]

Sequence in context: A049362 A081639 A141137 this_sequence A151936 A078143 A141645

Adjacent sequences: A015375 A015376 A015377 this_sequence A015379 A015380 A015381

sign,easy

Olivier Gerard (olivier.gerard(AT)gmail.com)