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Search: id:A008527
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| A008527 |
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Coordination sequence for body-centered tetragonal lattice. |
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+0
2
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| 1, 10, 34, 74, 130, 202, 290, 394, 514, 650, 802, 970, 1154, 1354, 1570, 1802, 2050, 2314, 2594, 2890, 3202, 3530, 3874, 4234, 4610, 5002, 5410, 5834, 6274, 6730, 7202, 7690, 8194, 8714, 9250, 9802
(list; graph; listen)
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OFFSET
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0,2
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REFERENCES
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M. O'Keeffe, Coordination sequences for lattices, Zeit. f. Krist., 210 (1995), 905-908.
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FORMULA
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a(0) = 1; a(n) = 8*n^2+2 for n>0.
a(n) = (2n+1)^2 + (2n-1)^2 for n>0. Binomial transform of [1, 9, 15, 1, -1, 1, -1, 1,...] - Gary W. Adamson (qntmpkt(AT)yahoo.com), Dec 27 2007
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MAPLE
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[ seq( 8*k^2+2, k=0..40) ];
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CROSSREFS
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Apart from leading term, same as A108100.
Sequence in context: A119086 A002601 A020495 this_sequence A007584 A009924 A019257
Adjacent sequences: A008524 A008525 A008526 this_sequence A008528 A008529 A008530
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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