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 A030043 Unreduced denominator of volume of best symplectic packing of n balls in 4-dimensional ball. 4
 1, 2, 4, 1, 25, 25, 64, 289, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS These fractions are not reduced. For the reduced fractions see A125846/A125847. - N. J. A. Sloane, Feb 12 2021 REFERENCES P. Biran, Symplectic packing in dimension 4, Geom. Funct. Anal. 7(1997), 420-437, MR1466333. Dusa McDuff and Leonid Polterovich, Symplectic packings and algebraic geometry, Invent. Math. 115 (1994), 405-434. Schlenk, Felix. "Dusa McDuff and symplectic geometry." arXiv preprint arXiv:2011.03317 (2020). LINKS Table of n, a(n) for n=1..91. CROSSREFS Cf. A030042, A125846/A125847. Sequence in context: A224783 A214058 A173820 * A045497 A117258 A152285 Adjacent sequences: A030040 A030041 A030042 * A030044 A030045 A030046 KEYWORD nonn,frac AUTHOR N. J. A. Sloane. STATUS approved

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Last modified September 8 21:25 EDT 2024. Contains 375759 sequences. (Running on oeis4.)