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A110973 Number of vectors in Barnes-Wall lattice BW_{2^n} with twice the minimal norm, divided by 2^(n+1). 1
1, 3, 135, 16335, 75700575 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Converges 2-adically.

LINKS

Table of n, a(n) for n=1..5.

N. Heninger, E. M. Rains and N. J. A. Sloane, On the Integrality of n-th Roots of Generating Functions, J. Combinatorial Theory, Series A, 113 (2006), 1732-1745.

Index entries for sequences related to Barnes-Wall lattices

CROSSREFS

Sequence in context: A101721 A173582 A065973 * A136411 A193136 A037120

Adjacent sequences:  A110970 A110971 A110972 * A110974 A110975 A110976

KEYWORD

hard,nonn

AUTHOR

Eric Rains (rains(AT)caltech.edu) and N. J. A. Sloane, Sep 27 2005

STATUS

approved

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Last modified June 20 05:01 EDT 2019. Contains 324229 sequences. (Running on oeis4.)