OFFSET
1,1
COMMENTS
2*Pi^2*n^3 - surface area of the 4-dimensional sphere of radius n.
LINKS
Eric Weisstein's World of Mathematics, Hypersphere
Eric Weisstein's World of Mathematics, Floor Function
Wikipedia, N-sphere
FORMULA
a(n) = floor(2*Pi^2*n^3).
a(n) = floor(2*Pi^2*A000578(n)).
MATHEMATICA
Table[Floor[2 Pi^2 n^3], {n, 1, 30}]
PROG
(PARI) a(n) = floor(2*Pi^2*n^3) \\ Charles R Greathouse IV, Sep 18 2015
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Sep 01 2015
STATUS
approved