C. Banderier, P. Flajolet, D. Gardy, M. Bousquet-Melou, A. Denise, and D. Gouyou-Beauchamps. (2004)cite arxiv:math/0411250Comment: This article corresponds, up to minor typo corrections, to the article submitted to Discrete Mathematics (Elsevier) in Nov. 1999, and published in its vol. 246(1-3), March 2002, pp. 29-55.