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a(n) = the maximum number of lattice points touched by an origin-centered 4d-sphere with radius <= n.
3

%I #5 Oct 19 2017 03:14:02

%S 8,32,104,192,312,576,768,960,1344,1872,1920,2496,2976,3072,4608,4608,

%T 5760,5760,6912,8064,8064,9672,10368,11520,11520,14976,14976,14976,

%U 17424,17784,18432,22464,23808,23808,26208,26208,29760,29952,32832

%N a(n) = the maximum number of lattice points touched by an origin-centered 4d-sphere with radius <= n.

%F a(n) = max(1=0 to n^2) A000118(i)

%e a(4)=192 because the 4d-sphere with radius sqrt(14) touches 192 lattice points.

%o (FORTRAN) See A071339.

%Y Cf. A000118, A071339-A071347.

%K easy,nonn

%O 1,1

%A _Hugo Pfoertner_, May 22 2002

%E Edited by _Don Reble_, Nov 06 2005