id:A146034 - 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 3X3 el 1,1 1,2 1,3 2,3 3,3 in any orientation.

+0
1

1, 1, 1, 3, 3, 7, 15, 43, 83, 271, 633, 3283, 9541, 54293, 204827, 1408893, 6437305, 54681853, 303651861, 3282191633, 22628378377, 297350762879, 2544553561975, 41024771076465, 431789004830701, 8608866149320377, 111456693040140865 (list; graph; listen)

	OFFSET	`1,4`
	EXAMPLE	`Maximal 8 X 8 example` `.0.0.1.0.0.1.1.1` `.0.0.1.0.1.0.0.1` `.1.1.1.0.1.0.0.1` `.0.0.0.0.1.1.1.0` `.0.1.1.1.0.0.0.0` `.1.0.0.1.0.1.1.1` `.1.0.0.1.0.1.0.0` `.1.1.1.0.0.1.0.0`
	CROSSREFS	`Sequence in context: A004043 A104176 A032294 this_sequence A032029 A058492 A058571` `Adjacent sequences: A146031 A146032 A146033 this_sequence A146035 A146036 A146037`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Oct 26 2008`

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Last modified November 24 19:42 EST 2009. Contains 167435 sequences.

AT&T Labs Research