A038589 - OEIS

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A038589

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

1, 7, 7, 13, 19, 19, 19, 31, 31, 37, 37, 37, 43, 55, 55, 55, 61, 61, 61, 73, 73, 85, 85, 85, 85, 91, 91, 97, 109, 109, 109, 121, 121, 121, 121, 121, 127, 139, 139, 151, 151, 151, 151, 163, 163, 163, 163, 163, 169, 187, 187, 187, 199, 199, 199 (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	`Partial sums of A004016.` `Equals 1 + A014201(n). - Neven Juric, May 10 2010`
	CROSSREFS	`Cf. A038590.` `Sequence in context: A143429 A168301 A072821 * A109539 A109541 A173314` `Adjacent sequences: A038586 A038587 A038588 * A038590 A038591 A038592`
	KEYWORD	`nonn,easy,nice`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified February 16 13:12 EST 2012. Contains 205909 sequences.