A110973 Number of vectors in Barnes-Wall lattice BW_{2^n} with twice the minimal norm, divided by 2^(n+1).

1, 3, 135, 16335, 75700575

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 * A361195 A136411 A193136

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