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: A079396 A013775 A068277 this_sequence A064031 A013911 A104937
Adjacent sequences: A068286 A068287 A068288 this_sequence A068290 A068291 A068292
nonn
Ron Hardin (rhh(AT)cadence.com), Feb 24 2002
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