8,2

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: A015362 A015363 A015364 this_sequence A015366 A015367 A015368

Sequence in context: A081641 A028965 A034645 this_sequence A105004 A072237 A011522

nonn,easy

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