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A038590 Sizes of clusters in hexagonal lattice A_2 centered at lattice point. +0
5
1, 7, 13, 19, 31, 37, 43, 55, 61, 73, 85, 91, 97, 109, 121, 127, 139, 151, 163, 169, 187, 199, 211, 223, 235, 241, 253, 265, 271, 283, 295, 301, 313, 337, 349, 361, 367, 379, 385, 397, 409, 421, 433, 439, 451, 463, 475, 499, 511, 517, 535, 547 (list; graph; listen)
OFFSET

0,2

COMMENT

The hexagonal lattice is the familiar 2-dimensional lattice in which each point has 6 neighbors. This is sometimes called the triangular lattice.

LINKS

G. Nebe and N. J. A. Sloane, Home page for hexagonal (or triangular) lattice A2

FORMULA

unique(A038589).

CROSSREFS

Cf. A004016, A038589.

Sequence in context: A088513 A004611 A133290 this_sequence A129389 A107925 A002476

Adjacent sequences: A038587 A038588 A038589 this_sequence A038591 A038592 A038593

KEYWORD

nonn,easy,nice

AUTHOR

njas

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Last modified July 6 17:22 EDT 2008. Contains 140988 sequences.


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