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A035923 Coordination sequence for diamond structure D^+_94. (Edges defined by l_1 norm = 1.) 0
1, 17672, 52061712, 61391167256, 38825509612576, 15302398872758568, 4120497500732109360, 806702657594563281720, 120115347392454996777024, 14074138851456769627934024, 1332957195176687643919679056 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..10.

J. H. Conway and N. J. A. Sloane, Low-Dimensional Lattices VII: Coordination Sequences, Proc. Royal Soc. London, A453 (1997), 2369-2389 (pdf).

Joan Serra-Sagrista, Enumeration of lattice points in l_1 norm, Inf. Proc. Lett. 76 (1-2) (2000) 39-44.

MAPLE

f := proc(m) local k, t1; t1 := 2^(n-1)*binomial((n+2*m)/2-1, n-1); if m mod 2 = 0 then t1 := t1+add(2^k*binomial(n, k)*binomial(m-1, k-1), k=0..n); fi; t1; end; where n=94.

CROSSREFS

Sequence in context: A273035 A036377 A237080 * A137878 A165598 A187641

Adjacent sequences:  A035920 A035921 A035922 * A035924 A035925 A035926

KEYWORD

nonn

AUTHOR

Joan Serra-Sagrista (jserra(AT)ccd.uab.es)

EXTENSIONS

Recomputed by N. J. A. Sloane, Nov 27 1998

STATUS

approved

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Last modified July 16 23:49 EDT 2019. Contains 325092 sequences. (Running on oeis4.)