A057422 - OEIS

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A057422

Axially symmetric (about axis 2) 2n-celled polyominoes with 1 hole.

0, 2, 4, 12, 24, 57, 112, 244, 483, 998, 1979 (list; graph; refs; listen; history; internal format)

	OFFSET	`4,2`
	LINKS	`Tomas Oliveira e Silva, Enumeration of polyominoes`
	CROSSREFS	`Sequence in context: A201078 A004645 A045687 * A036045 A100538 A135139` `Adjacent sequences: A057419 A057420 A057421 * A057423 A057424 A057425`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Sep 05 2000`

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Last modified February 15 07:58 EST 2012. Contains 205717 sequences.