A057418 - OEIS

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A057418

Number of n-celled polyominoes with 1 hole.

1, 6, 37, 195, 975, 4622, 21128, 94109, 410820, 1766591, 7506179, 31596240, 131991619, 547992183, 2263477612, 9309386178, 38150082057, 155859235424, 635067478628, 2581737704039 (list; graph; refs; listen; history; internal format)

	OFFSET	`7,2`
	LINKS	`Tomas Oliveira e Silva, Enumeration of polyominoes`
	CROSSREFS	`Sequence in context: A056338 A056328 A156185 * A001419 A081152 A033116` `Adjacent sequences: A057415 A057416 A057417 * A057419 A057420 A057421`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Sep 05 2000`

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Last modified February 15 21:41 EST 2012. Contains 205860 sequences.