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Search: id:A055416
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| A055416 |
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Number of points in Z^10 of norm <= n. |
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+0
1
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| 1, 21, 4541, 198765, 3083569, 27634481, 164379601, 759891589, 2839094517, 9183188589, 26107328109, 67602028569, 160441685209, 357086356401, 746545031221, 1487788785845, 2829595966381, 5188248484757, 9170828884817
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Here "norm" is being used in the sense of L_2 norm, as opposed to the definition in SPLAG. - njas, Sep 29 2007
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REFERENCES
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J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag.
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EXAMPLE
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To check that a(2) = 4541:
norm^2 # total
0 1 1
1 20 21
2 180 201
3 960 1161
4 3380 4541
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CROSSREFS
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Sequence in context: A018238 A098724 A078395 this_sequence A074053 A028451 A135823
Adjacent sequences: A055413 A055414 A055415 this_sequence A055417 A055418 A055419
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KEYWORD
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nonn
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AUTHOR
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David W. Wilson (davidwwilson(AT)comcast.net)
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EXTENSIONS
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Edited by njas, Sep 29 2007
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