0,2
The hexagonal lattice is the familiar 2-dimensional lattice in which each point has 6 neighbors. This is sometimes called the triangular lattice.
G. Nebe and N. J. A. Sloane, Home page for hexagonal (or triangular) lattice A2
Union of A038588 and A038590.
Sequence in context: A104463 A072757 A032849 this_sequence A138038 A095029 A028792
Adjacent sequences: A038588 A038589 A038590 this_sequence A038592 A038593 A038594
nonn
N. J. A. Sloane (njas(AT)research.att.com).
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