id:A038589 - OEIS Search Results

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

+0
2

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; 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	`Partial sums of A004016.`
	CROSSREFS	`Cf. A038590.` `Sequence in context: A116934 A143429 A072821 this_sequence A109539 A109541 A040043` `Adjacent sequences: A038586 A038587 A038588 this_sequence A038590 A038591 A038592`
	KEYWORD	`nonn,easy,nice`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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