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: A036514 A079396 A013775 this_sequence A068289 A064031 A013911
Adjacent sequences: A068274 A068275 A068276 this_sequence A068278 A068279 A068280
nonn
Ron Hardin (rhh(AT)cadence.com), Feb 24 2002
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