A038590 - OEIS

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A038590

Sizes of clusters in hexagonal lattice A_2 centered at lattice point.

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; refs; listen; history; internal format)

	OFFSET	`0,2`
	COMMENTS	`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 * A129389 A107925 A002476` `Adjacent sequences: A038587 A038588 A038589 * A038591 A038592 A038593`
	KEYWORD	`nonn,easy,nice`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified February 16 09:27 EST 2012. Contains 205904 sequences.