id:A146033 - OEIS Search Results

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Number of n X n binary arrays symmetric about main diagonal 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, 3, 7, 15, 39, 189, 995, 5569, 37913, 366061, 4244909, 58320195, 974389263, 20855855835, 546928072163, 17575257415665, 693118931384501, 34026835620030291, 2054942936198627105, 152983262052724174217 (list; graph; listen)

	OFFSET	`1,3`
	EXAMPLE	`Maximal 8 X 8 example` `.1.1.1.0.0.1.1.1` `.1.0.0.0.0.0.0.1` `.1.0.1.1.1.0.0.1` `.0.0.1.0.0.0.0.0` `.0.0.1.0.1.1.1.0` `.1.0.0.0.1.0.0.1` `.1.0.0.0.1.0.0.1` `.1.1.1.0.0.1.1.1`
	CROSSREFS	`Sequence in context: A018020 A147106 A078161 this_sequence A147188 A050565 A097111` `Adjacent sequences: A146030 A146031 A146032 this_sequence A146034 A146035 A146036`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Oct 26 2008`

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Last modified December 17 23:40 EST 2009. Contains 171025 sequences.

AT&T Labs Research