id:A030228 - OEIS Search Results

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Number of n-celled polyominoes without bilateral symmetry.

+0
3

0, 0, 0, 2, 6, 25, 88, 335, 1215, 4534, 16823, 63159, 237679, 900341, 3423201, 13073163, 50095285, 192599091, 742576616, 2870584814, 11122879867, 43191525139 (list; graph; listen)

	OFFSET	`1,4`
	COMMENT	`A000105(n) + a(n) = A000988(n) because the number of free polyominoes plus the number of polyominoes lacking bilateral symmetry equals the number of one-sided polyominoes. - Graeme McRae" (g_m(AT)mcraefamily.com), Jan 05 2006`
	CROSSREFS	`Sequence in context: A086591 A073545 A103063 this_sequence A066317 A027104 A019048` `Adjacent sequences: A030225 A030226 A030227 this_sequence A030229 A030230 A030231`
	KEYWORD	`nonn`
	AUTHOR	`Dave Wilson`

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Last modified December 20 16:54 EST 2009. Contains 171081 sequences.

AT&T Labs Research