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: A127490 A128149 A054832 * A096628 A051024 A177087
Adjacent sequences: A068287 A068288 A068289 * A068291 A068292 A068293
nonn
R. H. Hardin (rhhardin(AT)att.net), Feb 24 2002