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A035830 Coordination sequence for lattice D*_90 (with edges defined by l_1 norm = 1). 0
1, 180, 16200, 972060, 43750800, 1575612036, 47297528280, 1217347592940, 27425793987360, 549462705652820, 9912269336940648, 162650331363653820, 2448015194902257840, 34033222209800507940, 439668298578779894520 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
Joan Serra-Sagrista, Enumeration of lattice points in l_1 norm, Inf. Proc. Lett. 76 (1-2) (2000) 39-44.
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=90.
CROSSREFS
Sequence in context: A214818 A287022 A217791 * A244056 A091033 A146530
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, J. Serra-Sagrista (jserra(AT)ccd.uab.es)
STATUS
approved

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Last modified July 18 00:08 EDT 2024. Contains 374377 sequences. (Running on oeis4.)