id:A146662 - 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 1100-0111-0001 pattern in any orientation.

+0
1

1, 1, 1, 1, 1, 1, 1, 3, 9, 19, 41, 133, 407, 1175, 4535, 22999, 120797, 662265, 4237243, 30856447, 236921167, 2042840001, 20458483743, 233380921399 (list; graph; listen)

	OFFSET	`1,8`
	EXAMPLE	`Maximal 8 X 8 example` `.0.0.0.0.0.1.1.0` `.0.0.0.1.1.1.0.1` `.0.0.0.1.0.0.1.1` `.0.1.1.0.0.0.1.0` `.0.1.0.0.0.1.1.0` `.1.1.0.0.1.0.0.0` `.1.0.1.1.1.0.0.0` `.0.1.1.0.0.0.0.0`
	CROSSREFS	`Sequence in context: A146441 A147341 A160704 this_sequence A145947 A153084 A147371` `Adjacent sequences: A146659 A146660 A146661 this_sequence A146663 A146664 A146665`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Nov 04 2008`

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Last modified December 4 15:11 EST 2009. Contains 170347 sequences.

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