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A057649 Nearest integer to ratio of volume of n-dimensional cube of side 2 to volume of n-dimensional ball of radius 1. 1
1, 1, 1, 2, 3, 6, 12, 27, 63, 155, 402, 1087, 3068, 8996, 27340, 85905, 278485, 929713, 3191201, 11245603, 40631628, 150342633, 569071745, 2201355134, 8694775795, 35035655103, 143916920872, 602218550964, 2565370007349, 11118142868084, 48994958103507 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,4
REFERENCES
J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 9.
LINKS
FORMULA
a(n) = 2^n*GAMMA(n/2+1)/Pi^(n/2).
CROSSREFS
Sequence in context: A108915 A082395 A061343 * A104872 A006082 A122889
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Sep 06 2003
STATUS
approved

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Last modified March 18 22:56 EDT 2024. Contains 370952 sequences. (Running on oeis4.)