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A008368
Number of orbits on points that are at n steps from the origin in the f.c.c. lattice.
1
1, 1, 3, 4, 7, 8, 13, 14, 20, 22, 29, 31, 40
OFFSET
0,3
LINKS
J. H. Conway and N. J. A. Sloane, Low-Dimensional Lattices VII: Coordination Sequences, Proc. Royal Soc. London, A453 (1997), 2369-2389 (pdf).
FORMULA
G.f. is conjectured to be (1-x^5)/((1-x)*(1-x^2)^2*(1-x^3)) (a conjecture of Simon Plouffe, see A023054).
CROSSREFS
Cf. A023054.
Sequence in context: A284491 A284506 A157419 * A023054 A374962 A060023
KEYWORD
nonn,more
STATUS
approved