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A035472
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Coordination sequence for lattice D*_6 (with edges defined by l_1 norm = 1).
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0
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1, 12, 72, 356, 1296, 3708, 8920, 18900, 36384, 65004, 109416, 175428, 270128, 402012, 581112, 819124, 1129536, 1527756, 2031240, 2659620, 3434832, 4381244, 5525784, 6898068, 8530528, 10458540, 12720552
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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REFERENCES
| J. Serra-Sagrista, Enumeration of lattice points in l_1 norm, Information Processing Letters, 76, no. 1-2 (2000), 39-44.
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FORMULA
| a(m)=add(2^k*binomial(n, k)*binomial(m-1, k-1), k=0..n)+2^n*binomial((n+2*m)/2-1, n-1); with n=6.
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CROSSREFS
| Sequence in context: A118979 A014970 A036392 * A036398 A125322 A126480
Adjacent sequences: A035469 A035470 A035471 * A035473 A035474 A035475
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), J. Serra-Sagrista (jserra(AT)ccd.uab.es)
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