id:A146058 - 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 2X3 U in any orientation.

+0
1

1, 1, 1, 1, 1, 1, 3, 7, 13, 21, 51, 159, 577, 2001, 7625, 31703, 159573, 881761, 5519227, 36692597, 286423433, 2406566921, 23662937019, 247567053249, 2997634212141, 39099498214505, 595262340859501, 9726061577357237, 184962190180592957 (list; graph; listen)

	OFFSET	`1,7`
	EXAMPLE	`Maximal 8 X 8 example` `.0.0.0.1.1.0.0.0` `.0.0.0.0.1.0.0.0` `.0.0.0.1.1.0.0.0` `.1.0.1.0.0.1.1.1` `.1.1.1.0.0.1.0.1` `.0.0.0.1.1.0.0.0` `.0.0.0.1.0.0.0.0` `.0.0.0.1.1.0.0.0`
	CROSSREFS	`Sequence in context: A147501 A147335 A147464 this_sequence A155354 A136219 A078582` `Adjacent sequences: A146055 A146056 A146057 this_sequence A146059 A146060 A146061`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Oct 26 2008`

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Last modified December 5 08:19 EST 2009. Contains 170347 sequences.

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