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 A035803 Coordination sequence for lattice D*_36 (with edges defined by l_1 norm = 1). 0
 1, 72, 2592, 62232, 1121472, 16186536, 194986080, 2017132920, 18300435840, 147972367880, 1080041397408, 7190430174936, 44042615547456, 250012542410856, 1323529602867936, 6569619630522168, 30721376739859200 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Starts to differ from A035731 at n=18. - Mark van Hoeij Apr 22 2013 REFERENCES J. Serra-Sagrista, Enumeration of lattice points in l_1 norm, Information Processing Letters, 76, no. 1-2 (2000), 39-44. LINKS Index entries for linear recurrences with constant coefficients, signature (36, -630, 7140, -58905, 376992, -1947792, 8347680, -30260340, 94143280, -254186856, 600805296, -1251677700, 2310789600, -3796297200, 5567902560, -7307872110, 8597496600, -9075135300, 8597496600, -7307872110, 5567902560, -3796297200, 2310789600, -1251677700, 600805296, -254186856, 94143280, -30260340, 8347680, -1947792, 376992, -58905, 7140, -630, 36, -1). 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=36. CROSSREFS Sequence in context: A035118 A017788 A035731 * A017735 A141054 A173192 Adjacent sequences:  A035800 A035801 A035802 * A035804 A035805 A035806 KEYWORD nonn AUTHOR N. J. A. Sloane, J. Serra-Sagrista (jserra(AT)ccd.uab.es) STATUS approved

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Last modified June 19 00:04 EDT 2021. Contains 345125 sequences. (Running on oeis4.)