A001386 revision #15
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A001386
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Coordination sequence for 4-dimensional I-centered tetragonal orthogonal lattice.
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2
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1, 12, 56, 164, 368, 700, 1192, 1876, 2784, 3948, 5400, 7172, 9296, 11804, 14728, 18100, 21952, 26316, 31224, 36708, 42800, 49532, 56936, 65044, 73888, 83500, 93912, 105156, 117264, 130268, 144200
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listen;
history;
text;
internal format)
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OFFSET
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0,2
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REFERENCES
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M. O'Keeffe, Coordination sequences for lattices, Zeit. f. Krist., 210 (1995), 905-908.
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LINKS
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EXAMPLE
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G.f.: (1+x)^2*(1+6*x+x^2)/(1-x)^4. - Colin Barker, Apr 14 2012
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MAPLE
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[ seq( (16*k^3+20*k)/3, k=1..40) ];
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MATHEMATICA
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CoefficientList[Series[(1+x)^2*(1+6*x+x^2)/(1-x)^4, {x, 0, 30}], x] (* Vincenzo Librandi, Apr 15 2012 *)
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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proposed
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