id:A145956 - OEIS Search Results

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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a zee 1,1 1,2 2,2 2,3 in any orientation.

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1, 1, 1, 1, 1, 3, 7, 13, 37, 103, 343, 1549, 7241, 37919, 236383, 1636125, 13465687, 128312593, 1395150187, 17424865195, 251739719221, 4153202993611, 79756129711801, 1753738354816013, 44633769685103851, 1301658659951823679 (list; graph; listen)

	OFFSET	`1,6`
	EXAMPLE	`Maximal 8 X 8 example` `.0.0.0.0.0.0.0.0` `.0.0.0.0.1.1.0.0` `.0.0.0.1.1.0.1.0` `.0.0.1.0.0.1.1.0` `.0.1.1.0.0.1.0.0` `.0.1.0.1.1.0.0.0` `.0.0.1.1.0.0.0.0` `.0.0.0.0.0.0.0.0`
	CROSSREFS	`Sequence in context: A166283 A147448 A146449 this_sequence A155225 A051842 A147447` `Adjacent sequences: A145953 A145954 A145955 this_sequence A145957 A145958 A145959`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Oct 25 2008`

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Last modified December 1 19:22 EST 2009. Contains 167811 sequences.

AT&T Labs Research