A008374 Number of orbits on points that are at n steps from 0 in D_9 lattice.

1, 1, 4, 8, 18, 33, 62, 104, 175, 277, 433, 651, 969

Offset

0,3

Links

Table of n, a(n) for n=0..12.

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

Crossrefs

Sequence in context: A008085 A001977 A008373 * A201686 A008240 A008375

Adjacent sequences: A008371 A008372 A008373 * A008375 A008376 A008377

Keyword

nonn

Author

N. J. A. Sloane and J. H. Conway

Status

approved