id:A145860 - OEIS Search Results

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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in two by two blocks.

+0
1

1, 2, 3, 6, 16, 49, 169, 742, 3848, 23784, 176890, 1574720, 16764539, 214487123, 3284115855, 60203667877, 1323062783686, 34845447884285, 1099257570874298, 41549582286031187, 1881714538522030500, 102107501292816609976 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`Maximal 7 X 7 example` `.1.1.0.0.0.1.1` `.1.1.0.0.0.1.1` `.0.0.1.1.0.0.0` `.0.0.1.1.0.1.1` `.0.0.0.0.0.1.1` `.1.1.0.1.1.0.0` `.1.1.0.1.1.0.0`
	CROSSREFS	`Sequence in context: A159342 A089872 A006402 this_sequence A087983 A103593 A006449` `Adjacent sequences: A145857 A145858 A145859 this_sequence A145861 A145862 A145863`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Oct 22 2008`

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Last modified December 1 13:27 EST 2009. Contains 167806 sequences.

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