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A035917 Coordination sequence for diamond structure D^+_82. (Edges defined by l_1 norm = 1.) 1
1, 0, 13448, 0, 30150416, 0, 27063010712, 0, 13032761962016, 0, 3913291362389672, 0, 803284881791282480, 0, 119978383321782198200, 0, 13641020048513471601728, 0, 1221725104670456390191304, 0, 88546015593657513545141072, 0, 5307256748692946318313380312, 0, 267833718693896594307599764064, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

REFERENCES

J. Serra-Sagrista, Enumeration of lattice points in l_1 norm, Information Processing Letters, 76, no. 1-2 (2000), 39-44.

LINKS

Georg Fischer, Table of n, a(n) for n = 0..200

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

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=82.

CROSSREFS

Sequence in context: A323992 A157506 A238176 * A332387 A183676 A204394

Adjacent sequences:  A035914 A035915 A035916 * A035918 A035919 A035920

KEYWORD

nonn

AUTHOR

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

EXTENSIONS

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

Zeroes inserted by Georg Fischer, Jul 26 2020

STATUS

approved

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Last modified December 3 17:23 EST 2021. Contains 349467 sequences. (Running on oeis4.)