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Search: id:A031361
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| A031361 |
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Number of coincidence site lattices of index n in lattice Z^4. |
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+0
1
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| 1, 2, 16, 0, 36, 32, 64, 0, 168, 72, 144, 0, 196, 128, 576, 0, 324
(list; graph; listen)
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OFFSET
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1,2
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REFERENCES
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M. Baake, "Solution of coincidence problem...", in R. V. Moody, ed., Math. of Long-Range Aperiodic Order, Kluwer 1997, pp. 9-44.
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FORMULA
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Dirichlet series: (!+2^(1-s))* Product (1+p^(-s))*(1+p^(1-s))/((1-p^(1-s))*(1-p^(2-s))); p != 2.
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CROSSREFS
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Sequence in context: A080911 A056072 A136666 this_sequence A155955 A110709 A145684
Adjacent sequences: A031358 A031359 A031360 this_sequence A031362 A031363 A031364
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KEYWORD
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nonn,easy,nice,more
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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