id:A132445 - OEIS Search Results

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Number of n x n crossword puzzles with rotational symmetry and at most one black square per row.

+0
4

1, 3, 5, 7, 16, 47, 135, 643 (list; graph; listen)

	OFFSET	`3,2`
	COMMENT	`Acceptable crossword puzzles must have all words of length 3 or more, at least one word in each row and each column, and be connected.`
	LINKS	`Marc Brodie, Mathematica program`
	EXAMPLE	`a(5) = 5 because the only acceptable 5 x 5 crossword puzzles are (using 1's for black squares and 0's for white) are:` `00000 10000 10000 00001 00001` `00000 00000 10000 00000 00001` `00000 00000 00000 00000 00000` `00000 00000 00001 00000 10000` `00000 00001 00001 10000 10000`
	CROSSREFS	`Cf. A130578, A132443, A132444, A132446.` `Sequence in context: A080741 A073436 A010070 this_sequence A070846 A078683 A099863` `Adjacent sequences: A132442 A132443 A132444 this_sequence A132446 A132447 A132448`
	KEYWORD	`nonn`
	AUTHOR	`Marc Brodie (mbrodie(AT)wju.edu), Aug 21 2007`

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Last modified July 26 23:19 EDT 2008. Contains 142293 sequences.