id:A146638 - 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 1010-1111-0100 pattern in any orientation.

+0
1

1, 1, 1, 1, 1, 1, 1, 3, 9, 19, 33, 57, 181, 727, 3143, 12709, 46177, 203713, 1168453, 7869343, 57494841, 429662591, 3357500475 (list; graph; listen)

	OFFSET	`1,8`
	EXAMPLE	`Maximal 8 X 8 example` `.0.0.0.1.0.1.0.0` `.0.0.1.1.1.1.0.0` `.0.1.0.0.1.0.1.1` `.1.1.0.0.0.1.1.0` `.0.1.1.0.0.0.1.1` `.1.1.0.1.0.0.1.0` `.0.0.1.1.1.1.0.0` `.0.0.1.0.1.0.0.0`
	CROSSREFS	`Sequence in context: A058331 A049749 A147055 this_sequence A147135 A146843 A146630` `Adjacent sequences: A146635 A146636 A146637 this_sequence A146639 A146640 A146641`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Nov 04 2008`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

AT&T Labs Research