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Search: id:A033668
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| A033668 |
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Theta series of 4-dimensional lattice A_2 tensor A2, with det 81, minimal norm 4. |
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+0
1
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| 1, 0, 18, 12, 0, 36, 36, 0, 90, 12, 0, 72, 84, 0, 144, 72, 0, 108, 36, 0, 252, 96, 0, 144, 180, 0, 252, 12, 0, 180, 216, 0, 378, 144, 0, 288, 84, 0, 360, 168, 0, 252, 288, 0, 504, 72, 0, 288, 372, 0, 558, 216, 0, 324
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OFFSET
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0,3
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FORMULA
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After rescaling, this is equal to (theta series of A2)^2 + 2*(theta series of A_2 with respect to deep hole)^2, i.e. J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 111, Eq. (60)^2 + 2*Eq.(63)^2.
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CROSSREFS
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Adjacent sequences: A033665 A033666 A033667 this_sequence A033669 A033670 A033671
Sequence in context: A033965 A089517 A035616 this_sequence A030239 A040308 A077810
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KEYWORD
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nonn
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AUTHOR
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njas
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