id:A147432 - 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 1010-1111-0101 pattern in any orientation.

+0
1

1, 1, 1, 1, 1, 1, 1, 1, 3, 7, 13, 21, 39, 91, 251, 693, 2197, 6837, 23871, 89603, 379705, 1672695, 8302957, 42265243, 244734851, 1469763313 (list; graph; listen)

	OFFSET	`1,9`
	EXAMPLE	`Maximal 9 X 9 example` `.0.0.0.0.1.0.1.0.0` `.0.0.0.1.1.1.1.0.0` `.0.0.0.1.0.1.0.1.1` `.0.1.1.0.0.0.1.1.0` `.1.1.0.0.0.0.0.1.1` `.0.1.1.0.0.0.1.1.0` `.1.1.0.1.0.1.0.0.0` `.0.0.1.1.1.1.0.0.0` `.0.0.1.0.1.0.0.0.0`
	CROSSREFS	`Sequence in context: A138035 A032606 A098482 this_sequence A018367 A146369 A146377` `Adjacent sequences: A147429 A147430 A147431 this_sequence A147433 A147434 A147435`
	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