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COMMENTS
| a(7) >= 20937. Points (x,y) of the smallest n-cluster for 1 < n < 7 : (0,0), (1,0); (0,0), (3,0), (0,4); (0,0), (3,4), (3,-4), (6,0); (0,0), (16,30), (-16,30), (0,-33), (56,0); (0,0), (546,272), (960,720), (132,720), (546,-1120), (1155,-540).
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REFERENCES
| N. Fardin and B. Langlois, "Ensembles du plan a distances mutuelles rationnelles", Quadrature, 39 (2000), p. 23.
L. C. Noll and D. I. Bell, "n-clusters for 1 < n < 7", Math. Comput., 53 (1989), pp. 439-444.
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