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Search: id:A008386
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| A008386 |
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Crystal ball sequence for A_5 lattice. |
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+0
4
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| 1, 31, 271, 1281, 4251, 11253, 25493, 51563, 95693, 166003, 272755, 428605, 648855, 951705, 1358505, 1894007, 2586617, 3468647, 4576567, 5951257, 7638259, 9688029, 12156189, 15103779, 18597509
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Comment from T. D. Noe, Apr 29 2007: For the formula to produce this sequence, the two minus signs should be pluses and a 1 should be added: 21/10*n^5+21/4*n^4+28/3*n^3+35/4*n^2+137/30*n+1;
Comment from njas, 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
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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
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21/10*n^5-21/4*n^4+28/3*n^3+137/30*n-35/4*n^2;
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CROSSREFS
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Sequence in context: A089705 A125368 A126526 this_sequence A115151 A001298 A027841
Adjacent sequences: A008383 A008384 A008385 this_sequence A008387 A008388 A008389
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KEYWORD
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nonn
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AUTHOR
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njas and J. H. Conway (conway(AT)math.princeton.edu)
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