A034140 - A034150: formula

[T. D. Noe]

At 10:38 AM -0700 5/26/05, Frank Ruskey wrote:
>It might be noted that these sequences are all unimodal
>and that (1+x)(1+x^2)(1+x^3)...(1+x^n) is the rank
>generating function of the poset M(n), well loved
>by algebraic combinatorists.  See, e.g.,
>
>Robert A. Proctor,
>Solution of two difficult combinatorial problems
>with linear algebra, American Mathematical Monthly,
>1989, 721-734.

    ^----- should be 1982

Tony