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A157230
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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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0, 1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 2, 2, 1, 1, 1, 2, 2, 1, 1, 4, 1, 1, 1, 2, 1, 2
(list; graph; refs; listen; history; internal format)
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OFFSET
| 2,7
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COMMENTS
| With the exception of a(2), this matches A034380 as far as listed. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 27 2009]
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REFERENCES
| J. 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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LINKS
| J. S. Rutherford, Sublattice enumeration. IV. Equivalence classes..., Act. Cryst. A65 (2009) 156-163, Table 5 symmetry *mm2. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 27 2009]
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CROSSREFS
| Sequence in context: A071891 A046072 A072273 * A034380 A077479 A070106
Adjacent sequences: A157227 A157228 A157229 * A157231 A157232 A157233
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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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