4,2

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.

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

M. Sved, Gaussians and binomials, Ars. Combinatoria, 17A (1984), 325-351.

(Other) sage: [gaussian_binomial(n, 4, 5) for n in xrange(4, 14)] # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), May 27 2009]

Sequence in context: A020231 A038477 A141390 this_sequence A158398 A003914 A045074

Adjacent sequences: A006110 A006111 A006112 this_sequence A006114 A006115 A006116

easy,nonn,more

N. J. A. Sloane (njas(AT)research.att.com).