10,2

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: A015395 A015396 A015397 this_sequence A015399 A015400 A015401

Sequence in context: A017375 A017495 A017627 this_sequence A034614 A140501 A134448

nonn,easy

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