id:A057422 - OEIS Search Results

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

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

	OFFSET	`4,2`
	LINKS	`Tomas Oliveira e Silva, Enumeration of polyominoes`
	CROSSREFS	`Sequence in context: A133411 A004645 A045687 this_sequence A036045 A100538 A135139` `Adjacent sequences: A057419 A057420 A057421 this_sequence A057423 A057424 A057425`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Sep 05 2000`

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Last modified December 11 12:57 EST 2009. Contains 170656 sequences.