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%I #26 Jul 19 2020 04:04:40
%S 19,157,532,1263,2467,4263,6770,10106,14389,19739,26272,34109,43367,
%T 54164,66619,80851,96978,115119,135391,157913,182804,210183,240166,
%U 272874,308425,346936,388526,433315,481419,532958
%N The integer part of the surface area of the 4-dimensional sphere of radius n.
%C 2*Pi^2*n^3 - surface area of the 4-dimensional sphere of radius n.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/Hypersphere.html">Hypersphere</a>
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/FloorFunction.html">Floor Function</a>
%H Wikipedia, <a href="https://en.wikipedia.org/wiki/N-sphere">N-sphere</a>
%F a(n) = floor(2*Pi^2*n^3).
%F a(n) = floor(2*Pi^2*A000578(n)).
%t Table[Floor[2 Pi^2 n^3], {n, 1, 30}]
%o (PARI) a(n) = floor(2*Pi^2*n^3) \\ _Charles R Greathouse IV_, Sep 18 2015
%Y Cf. A038130, A000578, A164102 (2*Pi^2), A210519, A066644.
%K nonn
%O 1,1
%A _Ilya Gutkovskiy_, Sep 01 2015