id:A146049 - 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 2X2 block with tail 1,1 1,2 1,3 2,2 2,3 in any orientation.

+0
1

1, 1, 1, 3, 13, 35, 181, 1303, 13131, 161693, 2592581, 57377381, 1720164275, 69927099465, 3715147371129, 261988046119405, 24980387570081613, 3210146525819915095, 550205755804555982181, 125514016677735094761717 (list; graph; listen)

	OFFSET	`1,4`
	EXAMPLE	`Maximal 8 X 8 example` `.0.0.0.0.0.0.1.1` `.0.0.0.0.0.0.1.1` `.0.0.0.1.1.1.0.1` `.0.0.1.0.1.1.0.0` `.0.0.1.1.0.0.1.1` `.0.0.1.1.0.0.1.1` `.1.1.0.0.1.1.0.1` `.1.1.1.0.1.1.1.0`
	CROSSREFS	`Sequence in context: A146741 A146725 A146424 this_sequence A061483 A128288 A113115` `Adjacent sequences: A146046 A146047 A146048 this_sequence A146050 A146051 A146052`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Oct 26 2008`

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Last modified December 7 23:50 EST 2009. Contains 170430 sequences.

AT&T Labs Research