1,2
Terms for rhombic- and staggered- hexagonal arrays are the same for n in 1..4.
Cf. A068239-A068305, A000332, A002417, A027441.
Sequence in context: A050926 A083933 A080317 * A178407 A178348 A060519
Adjacent sequences: A068276 A068277 A068278 * A068280 A068281 A068282
nonn
R. H. Hardin (rhhardin(AT)att.net), Feb 24 2002