2,2

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.

G.f.: 1/[(1-x)(1+10x)(1-100x)].

Sequence in context: A054216 A109627 A095372 this_sequence A131442 A116507 A083828

Adjacent sequences: A015258 A015259 A015260 this_sequence A015262 A015263 A015264

nonn,easy

Olivier Gerard (ogerard(AT)ext.jussieu.fr)