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A008922
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Crystal ball sequence for lattice {E_7}*.
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1
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1, 57, 995, 8683, 48429, 198677, 653791, 1825719, 4494329, 10016209, 20601723, 39670115, 72292453, 125732205, 210093239, 339085039, 530914929, 809317097, 1204728211, 1755619419, 2509994525, 3527064133
(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
| G.f.: (1+x)*(x^6+624*x^5+1959*x^4+1744*x^3+519*x^2+48*x+1)/(1-x)^8
68/35*n^7-2/5*n^6+74/5*n^5+8*n^4+56/5*n^3+97/5*n^2+37/35*n+1;
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CROSSREFS
| Sequence in context: A060891 A098995 A008390 * A116181 A000505 A179466
Adjacent sequences: A008919 A008920 A008921 * A008923 A008924 A008925
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KEYWORD
| nonn,nice
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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