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Packing density for n balls in complex projective plane using Fubini-Study metric (denominators).
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%I #19 Aug 02 2024 15:59:42

%S 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,

%T 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,

%U 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

%N Packing density for n balls in complex projective plane using Fubini-Study metric (denominators).

%H D. McDuff, <a href="http://www.ams.org/notices/199808/mcduff.pdf">Symplectic Structures--A New Approach to Geometry</a>, Notices Amer. Math. Soc. 45(8) (1998), pp. 952-960.

%H <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (1).

%F a(n) = 1 for n >= 9 [from McDuff]. - _Sean A. Irvine_, Mar 12 2021

%F G.f.: x*(1 + x + 2*x^2 - 3*x^3 + 24*x^4 + 39*x^6 + 225*x^7 - 288*x^8)/(1 - x). - _Elmo R. Oliveira_, Aug 02 2024

%Y Cf. A045496, A030043.

%K nonn,easy,frac

%O 1,2

%A _N. J. A. Sloane_