id:A103470 - OEIS Search Results

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Number of polyominoes without holes consisting of 4 regular unit n-gons.

+0
13

3, 5, 7, 7, 7, 11, 14, 19, 23, 23, 23, 29, 35, 42, 48, 47, 48, 57, 64, 74, 82, 81, 82, 93, 103, 115, 125, 123, 125, 139, 150, 165, 177, 175, 177, 193, 207, 224, 238, 235, 238, 257, 272, 292, 308, 305, 308, 329, 347, 369, 387, 383, 387, 411, 430, 455, 475, 471, 475 (list; graph; listen)

	OFFSET	`3,1`
	LINKS	`S. Kurz, k-polyominoes.`
	FORMULA	`see the link for a formula`
	EXAMPLE	`a(3)=3 because there are 3 polyiamonds consisting of 4 triangles and a(4)=5 because there are 5 polyominoes consisting of 4 squares.`
	CROSSREFS	`Cf. A103469, A103471, A103472, A103473.` `Adjacent sequences: A103467 A103468 A103469 this_sequence A103471 A103472 A103473` `Sequence in context: A127314 A092257 A104199 this_sequence A064002 A109535 A082433`
	KEYWORD	`nonn`
	AUTHOR	`Sascha Kurz (sascha.kurz(AT)uni-bayreuth.de), Feb 07 2005`

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Last modified January 8 02:43 EST 2009. Contains 152824 sequences.

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