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A008400
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Crystal ball sequence for E_6 lattice.
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1
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1, 73, 1135, 7831, 34147, 111835, 301645, 707365, 1492669, 2900773, 5276899, 9093547, 14978575, 23746087, 36430129, 54321193, 79005529, 112407265, 156833335, 215021215, 290189467, 386091091
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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REFERENCES
| M. O'Keeffe, Coordination sequences for lattices, Zeit. f. Krist., 210 (1995), 905-908.
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LINKS
| T. D. Noe, Table of n, a(n) for n=0..1000
Index entries for crystal ball sequences
J. H. Conway and N. J. A. Sloane, Low-Dimensional Lattices VII: Coordination Sequences, Proc. Royal Soc. London, A453 (1997), 2369-2389 (Abstract, pdf, ps).
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MAPLE
| 39/10*n^6+117/10*n^5+75/4*n^4+18*n^3+267/20*n^2+63/10*n+1;
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CROSSREFS
| Sequence in context: A104907 A123811 A057522 * A090685 A008392 A098676
Adjacent sequences: A008397 A008398 A008399 * A008401 A008402 A008403
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KEYWORD
| nonn,nice
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com) and J. H. Conway (conway(AT)math.princeton.edu)
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