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: A109929 A014609 A068275 this_sequence A083957 A010331 A088851
Adjacent sequences: A068284 A068285 A068286 this_sequence A068288 A068289 A068290
nonn
Ron Hardin (rhh(AT)cadence.com), Feb 24 2002
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