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A008388
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Crystal ball sequence for A_6 lattice.
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4
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1, 43, 505, 3067, 12559, 39733, 104959, 242845, 507781, 980407, 1775005, 3047815, 5006275, 7919185, 12127795, 18057817, 26232361, 37285795, 51978529, 71212723, 96048919, 127723597, 167667655
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| Comment from T. D. Noe, Apr 29 2007: For the formula to produce this sequence, the three minus signs should be pluses and a 1 should be added: 77/60*n^6+77/20*n^5+28/3*n^4+49/4*n^3+623/60*n^2+49/10*n+1;
Comment from N. J. A. Sloane (njas(AT)research.att.com), May 04 2007: In that case I need to recheck both the formula and the values to see which is correct.
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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
| 77/60*n^6-77/20*n^5+28/3*n^4+623/60*n^2-49/4*n^3-49/10*n;
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CROSSREFS
| Sequence in context: A194784 A184153 A184145 * A060888 A146979 A157722
Adjacent sequences: A008385 A008386 A008387 * A008389 A008390 A008391
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KEYWORD
| nonn
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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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