A147268 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 60th year, we have over 367,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A147268

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 0100-1100-0111-0001 pattern in any orientation.

1, 1, 1, 1, 1, 9, 29, 103, 511, 2699, 17395, 132609, 1255857, 18252625, 280167863, 5590707453 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,6`
	LINKS	`Table of n, a(n) for n=1..16.`
	EXAMPLE	`Maximal 8 X 8 example` `.0.0.1.0.0.0.1.0` `.0.1.1.1.0.1.1.1` `.0.1.0.0.0.1.0.0` `.1.1.0.0.1.1.0.0` `.0.0.1.1.0.0.1.1` `.0.0.1.0.0.0.1.0` `.1.1.1.0.1.1.1.0` `.0.1.0.0.0.1.0.0`
	CROSSREFS	`Sequence in context: A045862 A035075 A103535 * A147376 A201447 A288744` `Adjacent sequences: A147265 A147266 A147267 * A147269 A147270 A147271`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin, Nov 04 2008`
	STATUS	`approved`

License Agreements, Terms of Use, Privacy Policy. .

Last modified December 10 19:15 EST 2023. Contains 367717 sequences. (Running on oeis4.)