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: A078263 A109929 A014609 this_sequence A068287 A083957 A010331
Adjacent sequences: A068272 A068273 A068274 this_sequence A068276 A068277 A068278
nonn
Ron Hardin (rhh(AT)cadence.com), Feb 24 2002
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