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A145391
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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, 2, 3, 5, 4, 7, 5, 10, 8, 10, 7, 17, 8, 13, 14, 19, 10, 21, 11, 24, 18, 19, 13, 35, 17, 22, 22, 31, 16, 38, 17, 36, 26, 28, 26, 50, 20, 31, 30, 50, 22, 50, 23, 45, 42, 37, 25, 69, 30, 48, 38, 52, 28, 62, 38, 65, 42, 46, 31, 90, 32, 49, 55, 69, 44, 74, 35, 66, 50, 74
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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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 2].
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FORMULA
| a(n) = (A000203 + A145390)/2. [Rutherford] - N. J. A. Sloane, Mar 13 2009
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CROSSREFS
| Sequence in context: A143514 A085180 A114750 * A057756 A160051 A082746
Adjacent sequences: A145388 A145389 A145390 * A145392 A145393 A145394
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Feb 23 2009
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