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A157227 Number of sublattices of index n fixed by a certain point group (see reference for precise definition). 0
1, 1, 2, 2, 4, 2, 4, 4, 6, 4, 8, 4, 8, 8, 8, 6, 12, 6, 12, 10, 12, 8, 16, 10, 14, 12, 16, 10, 24 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,3

LINKS

Table of n, a(n) for n=2..30.

John S. Rutherford, Sublattice enumeration. IV. Equivalence classes of plane sublattices by parent Patterson symmetry and colour lattice group type, Acta Cryst. (2009). A65, 156-163. [See Table 4.]

CROSSREFS

Sequence in context: A033097 A036845 A094269 * A054536 A293664 A001316

Adjacent sequences:  A157224 A157225 A157226 * A157228 A157229 A157230

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Feb 25 2009

STATUS

approved

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Last modified February 17 23:47 EST 2018. Contains 299297 sequences. (Running on oeis4.)