id:A145955 - 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 zee 1,1 1,2 2,2 2,3 in any orientation.

+0
1

1, 1, 1, 3, 9, 23, 125, 821, 6239, 71403, 1048093, 19913069, 517074745, 17642361171, 795865550951, 47901047706833, 3815017258032049, 403246928224172293, 56605968541991726917, 10536114891916229568297, 2602764408693859006627701 (list; graph; listen)

	OFFSET	`1,4`
	EXAMPLE	`Maximal 8 X 8 example` `.0.0.0.0.0.0.1.0` `.0.0.0.0.0.0.1.1` `.0.0.0.1.1.0.0.1` `.0.0.1.0.1.1.0.0` `.0.0.1.1.0.0.1.0` `.0.0.0.1.0.0.1.1` `.1.1.0.0.1.1.0.1` `.0.1.1.0.0.1.1.0`
	CROSSREFS	`Sequence in context: A146392 A147508 A146472 this_sequence A129834 A029488 A024314` `Adjacent sequences: A145952 A145953 A145954 this_sequence A145956 A145957 A145958`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Oct 25 2008`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

AT&T Labs Research