A146856 - 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 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A146856

Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1101-0111-0100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 17, 27, 587, 1133, 10901, 28287, 585741, 1701229, 131274347, 487724577, 70353958073, 323657950757, 55264471537249, 310091943069627, 90510403672783457, 614791345688856355

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,7

LINKS

Table of n, a(n) for n=1..22.

EXAMPLE

Maximal 8 X 8 example

.1.1.0.0.0.0.1.1

.0.1.0.0.0.0.1.0

.1.1.1.0.0.1.1.1

.1.0.0.0.0.0.0.1

.0.0.1.0.0.1.0.0

.1.1.1.0.0.1.1.1

.0.1.0.0.0.0.1.0

.0.1.1.0.0.1.1.0

CROSSREFS

Sequence in context: A147202 A146776 A147218 * A217409 A256361 A293927

Adjacent sequences: A146853 A146854 A146855 * A146857 A146858 A146859

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved