OFFSET
0,3
LINKS
Ray Chandler, Table of n, a(n) for n = 0..1000
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.
Index entries for linear recurrences with constant coefficients, signature (0, 38, 0, -703, 0, 8436, 0, -73815, 0, 501942, 0, -2760681, 0, 12620256, 0, -48903492, 0, 163011640, 0, -472733756, 0, 1203322288, 0, -2707475148, 0, 5414950296, 0, -9669554100, 0, 15471286560, 0, -22239974430, 0, 28781143380, 0, -33578000610, 0, 35345263800, 0, -33578000610, 0, 28781143380, 0, -22239974430, 0, 15471286560, 0, -9669554100, 0, 5414950296, 0, -2707475148, 0, 1203322288, 0, -472733756, 0, 163011640, 0, -48903492, 0, 12620256, 0, -2760681, 0, 501942, 0, -73815, 0, 8436, 0, -703, 0, 38, 0, -1).
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=38.
CROSSREFS
KEYWORD
nonn
AUTHOR
Joan Serra-Sagrista (jserra(AT)ccd.uab.es)
EXTENSIONS
Recomputed by N. J. A. Sloane, Nov 27 1998
STATUS
approved