
LINKS

Table of n, a(n) for n=3..9.
Sophie Burrill, Marni Mishna and Jacob Post, On kcrossings and knestings of permutations, arXiv:0912.0239 [math.CO], 2009.
William Y. C. Chen, Eva Y. P. Deng, Rosena R. X. Du, Richard P. Stanley, and Catherine H. Yan, Crossings and nestings of matchings and partitions, Trans. Amer. Math. Soc., 359(4):1555{1575 (electronic), 2007.
Sylvie Corteel, Crossings and alignments of permutations, Adv. Appl. Math 38 (2007) 149163.
Anna de Mier, kNoncrossing and knonnesting graphs and fillings of Ferrers diagrams, arXiv:math/0602195 [math.CO], 2006.
Anna de Mier, knoncrossing and knonnesting graphs and fillings of Ferrers diagrams, Combinatorica, 27(6), 699720, 2007.
