id:A145939 - 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 2X2 elbow 1,1 1,2 2,1 in any orientation.

+0
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1, 1, 3, 5, 15, 39, 133, 511, 2773, 14873, 106373, 810293, 8275081, 88902809, 1280398135, 19384764865, 392921704943, 8381650583597, 239524090999801, 7208159770278487, 290528855860261289, 12317566856380616673 (list; graph; listen)

	OFFSET	`1,3`
	EXAMPLE	`Maximal 8 X 8 example` `.0.1.1.0.1.0.1.1` `.1.0.1.0.1.1.0.1` `.1.1.0.1.0.0.1.0` `.0.0.1.1.0.0.1.1` `.1.1.0.0.1.1.0.0` `.0.1.0.0.1.0.1.1` `.1.0.1.1.0.1.0.1` `.1.1.0.1.0.1.1.0`
	CROSSREFS	`Sequence in context: A018516 A138017 A148503 this_sequence A161703 A018551 A103425` `Adjacent sequences: A145936 A145937 A145938 this_sequence A145940 A145941 A145942`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Oct 25 2008`

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Last modified November 24 23:16 EST 2009. Contains 167481 sequences.

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