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: A015360 A015361 A015362 this_sequence A015364 A015365 A015366

Sequence in context: A089234 A106785 A034607 this_sequence A140658 A089446 A125780

nonn,easy

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