id:A054421 - OEIS Search Results

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Number of disconnected 3 X n binary matrices.

+0
5

0, 1, 11, 102, 882, 7295, 58533, 459484, 3547860, 27043405, 204016879, 1526141666, 11336059046, 83703379691, 614911337833, 4497505562616, 32769214114664, 237956784843737, 1722809101653651, 12440161483566494 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`A connected (0,1) matrix is one where you can get from any black square, i.e. 1, to any other by chess king moves.`
	REFERENCES	`R. Levy and J. Shapiro, Uniqueness in paint-by-numbers puzzles, preprint, 2000.`
	CROSSREFS	`Cf. A054417-A054420. 4A054421(n) + 2A054419(n) + A054420(n) = 7^n.` `Adjacent sequences: A054418 A054419 A054420 this_sequence A054422 A054423 A054424` `Sequence in context: A001387 A100580 A087744 this_sequence A037700 A037609 A055150`
	KEYWORD	`nonn`
	AUTHOR	`njas, May 22 2000`
	EXTENSIONS	`More terms from James A. Sellers (sellersj(AT)math.psu.edu), May 23 2000`

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Last modified May 16 01:24 EDT 2008. Contains 139630 sequences.

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