id:A146131 - 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 3X2 zee 1,1 1,2 1,3 2,3 2,4 in any orientation.

+0
1

1, 1, 1, 1, 1, 1, 5, 9, 21, 39, 159, 427, 2501, 9027, 58503, 271185, 2371669, 14600987, 167228191, 1344019107, 19775648697, 206847230557, 3987249030381, 54541478154327, 1370106516904685, 24431476697291095 (list; graph; listen)

	OFFSET	`1,7`
	EXAMPLE	`Maximal 8 X 8 example` `.0.0.1.1.1.0.0.0` `.0.0.0.0.1.1.0.0` `.1.0.0.0.0.0.1.0` `.1.0.0.0.0.0.1.1` `.1.1.0.0.0.0.0.1` `.0.1.0.0.0.0.0.1` `.0.0.1.1.0.0.0.0` `.0.0.0.1.1.1.0.0`
	CROSSREFS	`Sequence in context: A081883 A049744 A000323 this_sequence A083943 A097074 A050559` `Adjacent sequences: A146128 A146129 A146130 this_sequence A146132 A146133 A146134`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Oct 27 2008`

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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.

AT&T Labs Research