id:A057424 - OEIS Search Results

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Diagonally symmetric (about diagonal 2) 2n-celled polyominoes with 1 hole.

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1, 1, 5, 7, 21, 30, 88, 116, 336 (list; graph; listen)

	OFFSET	`6,3`
	LINKS	`Tomas Oliveira e Silva, Enumeration of polyominoes`
	CROSSREFS	`Sequence in context: A117321 A120035 A091154 this_sequence A027152 A076197 A002596` `Adjacent sequences: A057421 A057422 A057423 this_sequence A057425 A057426 A057427`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Sep 05 2000`

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Last modified December 4 15:11 EST 2009. Contains 170347 sequences.