A178686 Expansion of the polynomial (1+x^3)*(1+x^5)*(1+x^7)*(1+x^9).

1, 0, 0, 1, 0, 1, 0, 1, 1, 1, 1, 0, 2, 0, 1, 1, 1, 1, 0, 1, 0, 1, 0, 0, 1

Offset

0,13

Comments

This is the Poincaré polynomial for the Lie group A_4.

References

Borel, A. and Chevalley, C., The Betti numbers of the exceptional groups, Mem. Amer. Math. Soc. 1955, no. 14, pp 1-9.

Links

Table of n, a(n) for n=0..24.

Crossrefs

A row of A142724.

Sequence in context: A075446 A184159 A231122 * A142724 A174656 A364047

Adjacent sequences: A178683 A178684 A178685 * A178687 A178688 A178689

Keyword

nonn,fini,full

Author

N. J. A. Sloane, Dec 25 2010

Status

approved