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A157226
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Number of sublattices of index n fixed by a certain point group (see reference for precise definition).
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0
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1, 1, 2, 1, 3, 1, 2, 1, 3, 1, 4, 1, 3, 2, 2, 1, 3, 1, 4, 2, 3, 1, 4, 1, 3, 1, 4, 1, 6
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OFFSET
| 2,3
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REFERENCES
| John S. Rutherford, Sublattice enumeration. IV. Equivalence classes of plane sublattices by parent Patterson symmetry and colour lattice group type, Acta Cryst. (2009). A65, 156163. [See Table 5].
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CROSSREFS
| Sequence in context: A162696 A108103 A111376 * A156249 A164677 A001511
Adjacent sequences: A157223 A157224 A157225 * A157227 A157228 A157229
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Feb 25 2009
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