11,2

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.

Adjacent sequences: A015402 A015403 A015404 this_sequence A015406 A015407 A015408

Sequence in context: A096117 A140936 A022204 this_sequence A020409 A045107 A031752

sign,easy

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