id:A146433 - 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 101-111-101 pattern in any orientation.

+0
1

1, 1, 1, 1, 1, 1, 1, 1, 3, 5, 9, 13, 25, 49, 124, 263, 846, 2209, 7594, 21663, 81736, 275021, 1243671, 4831201, 26082779, 118314435, 731456697, 3805948133, 26532655113, 159482402665 (list; graph; listen)

	OFFSET	`1,9`
	EXAMPLE	`Maximal 9 X 9 example` `.0.0.0.1.0.1.0.0.0` `.0.0.0.1.1.1.0.0.0` `.0.0.0.1.0.1.0.0.0` `.1.1.1.0.0.0.1.1.1` `.0.1.0.0.0.0.0.1.0` `.1.1.1.0.0.0.1.1.1` `.0.0.0.1.0.1.0.0.0` `.0.0.0.1.1.1.0.0.0` `.0.0.0.1.0.1.0.0.0`
	CROSSREFS	`Sequence in context: A153263 A133033 A145365 this_sequence A134672 A082874 A127720` `Adjacent sequences: A146430 A146431 A146432 this_sequence A146434 A146435 A146436`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net)`

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

AT&T Labs Research