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A008398
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Crystal ball sequence for E_7 lattice.
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1
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1, 127, 3025, 28911, 162417, 652431, 2086241, 5659295, 13561889, 29504095, 59400241, 112234255, 201127185, 344628207, 568250433, 906272831, 1403829569, 2119308095, 3127077265, 4520566831
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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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
| 148/35*n^7+72/5*n^6+24*n^5+28*n^4+488/15*n^3+98/5*n^2+68/21*n+1;
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CROSSREFS
| Sequence in context: A152726 A069092 A024005 * A144969 A114535 A176357
Adjacent sequences: A008395 A008396 A008397 * A008399 A008400 A008401
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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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