A146270 - OEIS

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

A146270

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 110-111-110 pattern in any orientation.

1, 1, 1, 1, 1, 1, 8, 19, 32, 51, 140, 477, 1662, 6189, 24619, 109450, 533450, 2859993, 16886952, 110380054, 797354362, 6460189913, 58366269898, 572562441744, 6143132227217, 72768344185209 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,7`
	LINKS	`Table of n, a(n) for n=1..26.`
	EXAMPLE	`Maximal 8 X 8 example` `.0.0.0.0.1.1.0.0` `.0.1.0.0.1.1.1.0` `.1.1.1.0.1.1.0.0` `.1.1.1.0.0.0.0.0` `.0.0.0.0.0.1.1.1` `.0.0.1.1.0.1.1.1` `.0.1.1.1.0.0.1.0` `.0.0.1.1.0.0.0.0`
	CROSSREFS	`Sequence in context: A260004 A144171 A017485 * A146222 A140672 A230098` `Adjacent sequences: A146267 A146268 A146269 * A146271 A146272 A146273`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin`
	STATUS	`approved`

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 21 07:22 EDT 2022. Contains 353889 sequences. (Running on oeis4.)