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A072168 Floor of ratio of volume of n-dimensional cube of side 2 to volume of n-dimensional ball of radius 1. +0
2
1, 1, 1, 1, 3, 6, 12, 27, 63, 155, 401, 1086, 3067, 8995, 27340, 85905, 278484, 929713, 3191200, 11245602, 40631627, 150342632, 569071745, 2201355133, 8694775794, 35035655103, 143916920871, 602218550964, 2565370007348, 11118142868084, 48994958103507 (list; graph; listen)
OFFSET

0,5

REFERENCES

J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 9.

FORMULA

2^n*GAMMA(n/2+1)/Pi^(n/2).

CROSSREFS

Cf. A057649, A072345, A072346.

Sequence in context: A101013 A088688 A052103 this_sequence A018011 A025208 A049941

Adjacent sequences: A072165 A072166 A072167 this_sequence A072169 A072170 A072171

KEYWORD

nonn

AUTHOR

njas, Sep 06 2003

page 1

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.


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