OFFSET
1,2
COMMENTS
Terms for rhombic- and staggered- hexagonal arrays are the same for n in 1..4.
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 24 2002
EXTENSIONS
a(9) from Alois P. Heinz, May 03 2012
a(10)-a(12) from Sean A. Irvine, Feb 07 2024
STATUS
approved