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LINKS
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Table of n, a(n) for n=1..5.
Roger E. Behrend, Vincent A. Knight, Higher Spin Alternating sign matrices, El. J. Combinat 14 (2007) #R83
K. Mészáros, A. H. Morales, J. Striker, On flow polytopes, order polytopes, and certain faces of the alternating sign matrix polytope, arXiv preprint arXiv:1510.03357 [math.CO], 2015.
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